Hi JYH,
I suspect seeing a GI physician would be a very wise decision. Yes, it is possible you could have a social phobia............ A normal person never has to spend so much time worrying about criticisms or how other people might see or judge them. But for those dealing with social phobia, they are almost always troubled and conscious on what other notice and feel about them.
Therapists are the best ones to seek help from by those who have a social phobia so this may be something you want to look into also. I have a dx of GAD and have found therapy to be very helpful.
We are here to support you so please make the Dr. appointments and remember to be your own best advocate.
Kindly,
Kitt