i've had really bad anxiety and depression as of lately and i opened up to my best friend and showed her i had been self harming and told her i've been doing many drugs. i felt like i had to tell her cause i felt like i have been more boring/weird than usual and wanted to let her know why. she said she hadn't really noticed anything was different with me and that she will do anything she can to help me, even if it means coming to my therapy sessions for emotional support. 

i left her house later that night and everything between us seems normal. i ended up seeing a psychiatrist today and thanked her for being there for me and told her how much she meant to me. the psychiatrist wouldn't help me because of my drinking habits and i essentially ranted over text to her about how i need help and don't know what to do. and she remains supportive, but i'm just now realizing that i feel like i'm potentially ruining my friendship with her.

why would she want to surround herself with someone that has as many problems as i do and someone who is just so pussy about dealing with his problems. surely she can just replace me with someone whose normal. 

that thought scares me though because she's the closest friend i've ever had. should i be worried about losing her?