Why do you keep saying “let me help you” or “let God help you”?

I’ve been suffering from severe depression for more than 5 years.  I can’t get rid of the suicidal thoughts, I’ve been on anti-depressants for several years.  I tried everything I can to do to cure my depression and of course, I tried to let God help me several times.  But it didn’t work.  Medicine didn’t help, neither did God.  I’m not saying I don’t believe in God, I just don’t understand why people keep saying “let God help you” while that’s not really true?  Why?  5 years is not a short time, right?  help? really?