A good multivitamin is a good idea.
If you have depression
and are not on an antidepressant medication
already, you can try taking the amino acid 5 HTP, about 100 mgs a day, or up to 100mg 3 times a day. This will help restore normal seratonin levels and help you feel better as well.
Also, you can take imodium AD , brand name, for the diarhea. And drink tons of water, as well as soaking in hot water to help relax you.
I hope some of this helps.