Hi M.,
I had not seen your other posts about nausea, so I'll take a blind shot now.
We've all been through something like this. What seems most important to me M. is resolving the particular problem(s) that upsets you in the first place. This is first and utmost.
It is observant of you to notice your frame of mind at the time this nausea comes on. What upsets you at that moment is the key. You're going to have to change your outlook on things and approach life with more perseverance in spite of difficulties and obstacles.
Nerves can do strange things to the body, to the point you don't know if it's physical or mental anymore. I think you have diagnosed yourself correctly, but you should ask the Dr. for some help, because a good checkup wouldn't hurt.
You didn't tell us what your bowels are in an uproar over. The good thing is that YOU know what it is !!!!! It is over a particular thing (or things). Now, how do you confront and get rid of it? Only you would know that M..
Attack what ailes you head on instead of letting it follow you around like a dark cloud hovering. Don't let it fester so that you depend on tranquilizers to get you through. It won't take the problems away.
Whatever's going on, I know a state of peace and tranquility will come your way soon. Just remember this to shall pass, there's light at the end. You have a great life ahead of you. God bless.