What Causes Sickness And Vomiting After Going From One Place To Another?

I m 18 (19 in 5 months), 3 9 , and about 72 pounds. I have Dwarfism, but no bad health in the past. I have however had a problem my whole life that s seemed to get worse. Whenever I visit with family, friends, and even my boyfriend now I feel sick. I used to visit with my grandparents for a week every summer when I was a kid and I would vomit every night for the first few nights and feel nervous and sick for the rest, but then vomit for a few nights also when I came back home. I d do the same whenever I have gone for sleepovers. It used to be just near night time this would happen, but more recently it s been happening during the day when I go to visit my boyfriend for the day. It get shaky, and can t eat anything. It s like there is something blocking my throat. Almost like a bubble. And my stomach tightens. It s really become a bother, it just seems to get worse, I ll get it at home sometimes too, or I ll wake up in the middle of the night and have what feels like really bad gas pains, be overheated, clammy with sweats, and diarrhea. It gets so bad I think I may be dying when it happens. I worry constantly about everything, and I have a high stress life. Maybe that has something to do with it, but I think I have anxiety disorder and depression. I just want some answers, I can t even go to someone s house, be social, or have any kind of relationships because I don t want to end up getting sick and them having to deal with it.