suggestions?

so within the past 7 months I went from being 107 pounds to dropping to 84 pounds and my family continuously provokes me about it all the time saying that i never finish my food so I shouldn't be allowed to go to family dinners cause it's wasting money but the problem is that in the moment I feel hungry but once the food comes I wanna puke. but they just see it as me being over dramatic and just looking for attention even though they've all seen me throw up from forcing myself to eat. I just don't know what to do anymore I just want them to be supportive and try to help me instead of being assholes about it like if i can control it BUT BESIDES THE POINT does anyone know any good tips on gaining weight besides just eating more like what can I put into my diet plan to gain more healthy weight