TW: weight

I’ve had depression for a long time but since last year after a really bad break up amongst other things, it got even worse and it was the first time I felt such physical symptoms. My sleep patterns are terrible and I started losing weight unintentionally. 
I’ve been trying to gain weight but I still keep losing weight and now I’m at 99lbs and 5’5. I tried exercising to help my appetite but it made me lose more weight so I stopped. It’s not that I don’t eat at all, I just get full really quick and also don’t have any appetite cause of work. It’s hard to talk to my friends about it cause everyone’s always like skinny = better but I really hate how I am right now and just want to go back to normal. 

Are there any ways to regain my appetite again or does drinking protein shakes or something help? Just looking for some advice. Apologies if this is triggering for anyone.