Have you thought about the possibility of checking yourself into a hospital or recovery program for people struggling with things? It's good that you have tried out psychiatrists and medication, and I am sorry that none of them have been helping you out. It seems like you have dealt with a lot over the years. I know it must be really hard on you, and its understandable that you feel so down.

You have to sit down and have a serious convo with your mom/grandma and tell them that you aren't kidding around and want to get some help.

You said that your ucle rapes you, but nobody believes you. The next time that this happens (god forbid there is a next), call the police immediately afterwards. They will be able to get DNA from your body to hold it against him for proof that this occurs. I know it sounds scary, but you really need to get him locked up if he is doing this to you. who knows who else he might be doing it too. Rape is a terrible thing, and you should report this ASAP.

Hang in there. I hope you find the strength to get through all of these terrible things you are being put through. I can relate to you in some ways(I have been molested, and I suffered from depression for many years). If you need anyone to talk to, PM me any time.

I am so sorry that this has happened to you. My best friend was raped, and I am going through the same eating problems. I'm a 19 year old male, and know it's not at all good to have depression at that age.
PenguinsRus has given a lot of good advice. Especially the talking it out part. I have no way of knowing what you're going through right now. Just know I am praying for you, and hope you get better soon.