nausea in social situations

I've been having this problem for years now, but am just realizing that it's an SA related disorder. Does anyone have any advise regarding the best way to approach treatment?
I get an extremely nervous stomach when eating in certain social situations, particularly with women whom I'm interested in. It gets so bad that I can't even bring myself to eat, often have to excuse myself to go to the bathroom just to let my stomach calm down, and occasionally even vomit.
It only seems to happen when I'm in situations where I really want to leave a good impression on the person I'm with, particularly dates.
I've never had a problem when I'm with people whom I'm already good friends with, or with people whom I have little interest in impressing. I also don't have any problem eating in front of coworkers.
Interestingly, I once went on a date with a coworker, and even though we'd eaten lunch together many times at work with no problem, when we were on a date I started to get nauseated, and had to excuse myself, only to return and not be able to finish my dinner.
Clearly, this is embarassing, and is impacting my social life negatively as I feel I shouldn't even ask women out to dinner in order to preserve my dignity.
Also, to clarify, I don't seem to be experiencing any of the other symptoms of SA, I have a job with a high level of responsibility where I come in contact with lots of people, and have to speak to groups at least 4 times a day, and being in that situation actually makes my problem go away completely, which to me almost seems paridoxical given what I've read about the normal manifestations of SA.
Sorry for going on so long, but I've never really discussed the problem with anyone, and only recently realized that this is something I could, and should, seek help for. Thank you to anyone who is able to provide any constructive comments.

Hey, Maxkgm

I also have nausea when in social situations, not in general , but in some situations. I cannot eat with strangers or people I don't feel comfortable with. Anyway, I went to my doctor and I had to make an endoscopy. So I did. The results revealed a duodenal ulceration. This was about 5 years ago. Recently, I made another endoscopy along with a biopsy and the results were a bit worse. The damage has spread to my stomach. Many ulceras are provoqued by this bacteria "helicobacter pylori" and I'm about to take the right combination of meds to heal it. In my case, I was a bit negligent about it. I kept using drugs, smoking, alcohol, eating spicy and acid food and drinks.
This is my story. Could have been better but also could have been much worse.
So, my advice is to avoid anything that you feel it's triggering your nausea(food, cigarrettes, drinks) and visit a doctor. Endoscopy is so far the best way to diagnose any digestive system anomaly.

Feel free to message me if you want more details.

Best wishes.