How do I stop hair loss?

Should I start to get thin on top. My hair line is receding forehead and there is a small bald patch on top of the head. My hair in my head makes it look a little ‘thinner than before. People began to notice and make comments that are really getting me down. Im only 22: (What are the methods to stop hair loss, and also, if possible, gaining back some of the hair lost? I have tried prozac, but it seems that there are too many effects collaterali.Please help.

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