nervous vomiting

I found myself having difficulty in eating....feeling nausea most of the time..making me sick of the foods..and mostly i would vomit if i couldn't take it........I'm not sure whether i'm having eating disorder but i would starve myself due to the fear of eating......This is happening since i was very young....went to western doctors as well as chinese doctors but none of them can help me....The western doctor just told my mum that the nervousness made it......When i'm  eating with strangers especially girls....the sensation of vomiting is too great to overcome....i afraid i would puke in front of them....so i choose not to eat with my friends lock myself from my friends......i haven't been outing for a long time....but when eating with families,it will be better but still there is nausea.....When i go on stage to perform ,the nausea feeling attacks me too......Even when my friends talk about outings and where to eat or discuss about food......it somehow caused me nausea......i try to relax myself but it's very hard to overcome...any advice?Sorry for incorrect english