Help. Idk what's wrong with me

I need help. sometimes I have an empty stomach, a lump in my throat and nausea, especially when I am stressed or nervous. when I eat I get sick. at one point when I ate something I immediately felt sick. I am not hungry. I used to find myself depressed, then I took a break and did only what I like and what made me a fetish, I went away from society. I was on a yacht, I was in the mountains, ... I felt much better. when I came back I was fine. but then I started to get stressed with school and I have some problems with my family, ... and now I've started to feel worse than before for almost a month. I can't eat anymore, I have an empty stomach, I have a lump in my throat, I can't sleep at night, I'm tired, I'm weak, I can't concentrate, I get angry faster, when I get angry or stressed my skin stings harder. I cut myself. I kept refraining but more recently I can't refrain as before. I started smoking, it helps at the moment but it's not ok