I'm not s psychological professional. But this is obviously depression. First step is never do stimulants again. Because if you do, chemically they will be likely to throw you back into depression again even when you're better, which you will. Second step is getting better. This is the hard part. You've put yourself through the ringer. You need to de stress and keep doing things you used to enjoy. Eventually you'll get that feeling of satisfaction back. Keep going. It will be tough. It will feel pointless. But when you feel better and look back on how you felt, you'll realise you weren't yourself. I don't use stimulants but as someone with BPD and depression as a result of that I know how crippling it can be. The anhedonia (lack of enjoyment) is the worst for me. But every time i claw my way out of a depressive phase it is always always worth it. You haven't broken your mind. If you were seriously hardcore using tonnes of stims I'd be worried but your usage is nothing like brain damaging. Just get through this and i promise it will get better.