[Kotomi]

I think this last month I had a few similar occurrences
and I haven't figured it out as well: but don't know if it is from different reasons

possible reasons:
allergy
dehydration
stress
standing for long periods of time when your not used to it can cause it so some exercise could help
standing up quickly
pinched nerves...
possible other reasons, that I haven't found yet...

hmm some jobs you might be able to do:
-if you can handle kids, working in an after school program
-being a tutor- for any age
-daycare
-hmm you could also have a desk job but with that, and any other sitting job, you need to exercise... or symptoms may worsen when you stand