I'm a non-smoking vegetarian teetotaler who has to walk a kilometer between home and the bus stop. I hope that >counts.

Actually, in my experience, the amount of exercise needed for strong benefits to mood and energy is about 20 minutes hard exercise (talking during becomes difficult), at least 4 days per week. You could take up running. Murakami swears by it.

I don't have any suggestions for solving that, but I do think that as long as you hold that conflict it's going to be a big >obstacle to moving in any direction.

This. It may help to see you lack of security as a fair price payed for your career. Others experienced it early, you simply have to deal with it later on. People have overcome far worse. Start meditating.