KavaKava is a 'natural' supplement that calms some down. (it worked for me a couple of years ago when i was battling a homeless situation...) also zoloft did help me out. i was ticked when my doctor perscribed it to me, cause all the diarrhea was the problem, not my brain. BUT the two go together!!! and i found out that many cancer patients are given zoloft before they start their chemo, simply to help them in such a difficult time. so don't be shy about asking for info on an anti-depressant it could really help.
i too, take immodium on mornings when i am stressed, it helps me.
practicing yoga has helped me, it took a while to feel the effects, but it is worth it.
also why not journal? i know that a lot of what bothers me are the stupid things i tell myself, that really aren't true. (i am not smart, i am not good at my job...) after writing all my negative thoughts i then write the realistic thoughts next to them, and on paper i can then see how silly i am, and i am worrying about something that might not even happen!
talk to someone--anyone really, don't hold all your stresses inside! you are not alone. EVERYONE feels the way you do at some point.
take care of yourself,
what would you attempt to do if you knew you could not fail?