This isn’t related to emotion but I want to post this in a serious thread. I’ve been having an extremely difficult time remaining standing or even upright for longer than about 2 or 3 hours at a time for a while. I’m young, thin, and pretty well exercised and that’s not to say that I’m the portrait of good health, but that’s to say that there’s no easy explanation for this issue. It’s affecting my ability to do my job, which (obviously) concerns me.
Go see a doctor. Could be anemia and simple blood work will determine that.