u could try yoga and or self hypnosis
u r in a very strange field for be bothered by high stress
u must be a little brainiac to be 19 and 3rd yr med
here is something u might try;
u need a vitamin store; what u want r Pro-Biotics and u r looking for ultra high culture counts 100 billion daily for week (not million)
if u r in medical u might be able to get kefir or produce your own
u seem like many who may be too close to something to see the whole picture (trees for the forest)
all the meds for your stomach, intestinal tract may be doing more harm; the probiotics for a week if u look around closely can be bought $25 and if they work, they will work in day or two
best to u