Connie, I read a lot of posts about your problem, I do not know whether I am having the same level of problem like you but would like to share my own case.
I was a nervous person scaring of any trivial matters some more than ten years ago when I got married and having my son. That was the stage when I stepped from a girl to a married woman, taking up a lot of roles at once.
At that time, I had headaches and vomited a lot every weekends and had to take pills and rest in my bed. During weekdays when I had to work at the office, I had unexpected diaherra and scared of facing people. Too low of self-confidence and always tried to avoid people.
Later, because of my responsibility as a mother, I began to train myself to overcome my own weakness. I took up further study to strenthen my knowledge mentally, I took up gym to build up my health physically, I chose food carefully for my health and avoid cold food. Nowadays I get rid of panador, western medicine and attend to chinese medicine practitioner instead. I cannot drink soft drinks, cold water because of my stomachache, not to mention sasimi, seafood etc. Instead I always eat ginger, garlic, onion, a little bit red wine to warm my stomach and intestine.
Of course, at times I still have stomach and diaherra at unfavorable timing such as when I was stuck in traffic. I will then mentally tell myself to control the muscle tense by deep breathing, detracting my thoughts to some happy memories to prolong the need to go to toilet until I can find one nearby. Most of the time, I can master my own functioning of body.
Do try to take up more interests and hobbies to direct your mind from your problem, you will be your own doctor to heal your illness instead of any other professionals. Keep up with your goal to have good health.