If your health deteriorates further then you will not be able to complete your planned move, much less do something drastic like move now.

If your environment has toxic fungus, you cannot live for a year there and expect to be in any condition to move, to apply for a visa, or perhaps to be out of the hospital. I am trying not to be alarmist, and would very much like the opinion of better informed readers on the relative danger/safety of your situation, but you need to examine how much you weigh the inconvenience of moving or doing something about the problem versus your health or existential risks.

I've moved four times in the last three years across three continents. I've been lucky enough to not be coping with migraines and to have enough cashflow to make it work. I only mention it to point out that it is eminently feasible.

Is there anyone you can stay with for say a week to see if your condition improves vis-a-vie the migraines?