I didn't think utility mattered at the start, but the numbers get so large so fast that it probably should. So the first issue is identifying if you are theoretically optimizing (max value in min time) or satisficing. Optimizing is simple - always invest when +EV exists/sell when -EV exists. Even if you ruin 99% of the time, you'll average the highest returns (1 - note below on actual optimization).
The only reason this is complicated is because of the second issue; the risk of ruin. This issue is actually minor in a normal random walk situation.
I've simulated a few rules and assumptions to validate the argument. Since this leverages timing, even a negative average rate of return in the underlying shows a very high rate of return for the strategy. http://imgur.com/a/ZrH6g for a quick snapshot. There are a few issues that I didn't bother to fix (namely with compound rules of holding onto stock), as the effect differs in only a minor way. For reference, actual mean should be about 1.0002, but I've only shown 0.9, 1, and 1.1.
The issue becomes more complicated if you stop assuming a normal model. The risk of ruin increases dramatically for any probability of major loss. To mitigate this risk, simply have a trading rule that prevents that risk from materializing, ie: don't buy if this risk exists, sell if it does. There are lots of ways, both technical and not, to implement this rule. I ran it as a maximum of the sum of negative impact (probability x loss) using two distinct normal distributions (emulating a binary market choice, each with their own distributions). It works, which means the proper technical approach would be even better.
In general, the rule is simple; buy when the average return is positive, hold until it the average return is negative, sell when return is negative. To protect against the risk of ruin, reject any major possibility of loss; eg: do not trade when there is a high SD (or a lumpy negative distribution).
(1) Actual optimization is pretty complicated. All of the above assumes that you get the information and make the transaction immediately. However, true optimization would involve compensating for random walks away from the information you know to be true on the assumption that it would return to the mean. For instance, with the knowledge of the actual range you could break the "buy and hold" strategy below certain thresholds, such as if the stock random walked much higher/lower than would be expected (eg: bought expecting an average of 1.05 -> random walked to 1.10; sell at 1.10 as it is probable to return to 1.05 by end of day).
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Full disclosure here regarding personal issues. I'm looking for advice on how to resolve them to the point where they no longer affect my life majorly. I don't expect an issue this ingrained into my psyche to ever be gotten rid of entirely. I'm sure there are other places more directly related to the subject that I could request this advice, but LWers have usually seemed to have something useful to add to things.
Recently (toward the end of 2013), I slowed, and then stopped taking Zoloft for what was purported to be emotional instability, since I was about 7 until then, when I was 21. I do not regret doing this in the slightest, as, quite frankly, while on it I was extremely flatlined emotionally and had not grown hardly at all in that regard for years. Everything was quite dull.
I have, since then, had to resort to various techniques to calm myself, as getting off of Zoloft also revealed myself to be rather anxious, and to have had latent abandonment issues resulting in clinginess to my close friends. It is the latter part that I need help with, as most literature that I've found has been rather worthless in truly actionable things, as they suggest broad things to be done and little in regards to intermediary steps, or speak to the effects, consequences, and actions that should be taken when in a romantic relationship (which I am not).
Regarding how it feels when I have an episode (for the purpose of relating to it for other people with perhaps-similar issues), I want to curl up in the corner, I get panicky, and it feels like lightning's shooting through me as a cold, heavy lump forms in my belly.
Thanks for any help you can offer.
I'll repeat the same advice I got when I approached my doctor friends about anxiety.
Look for a clinical psychologist (language issue: I'm Canadian, not positive it is identical in the states) that has experience/specializes in anxiety issues. This was recommended after I'd done a physical - basic blood work and such - but it doesn't sound like you have anything that would be related to physical issues.
The general feel I got was that it takes a bit of work to tailor a solution to your specific situation/triggers and doing it yourself, with your own biases (which are likely to be severe in the area of your anxiety) getting in the way of any kind of self-diagnosis or self-help. Your anxiety attack, if that is what it is, sounds severe enough to seek help.