That said, while therapy is one thing(and very hard to find someone that actually helps you out of your misery instead of reinforcing it), I'd maybe suggest creating a fixed schedule. Some basic cardio sports at a fixed time and day once a week(if that is too much once every two weeks). Ideally a group practice that gives some social pressure. It's much harder to get out a tough spot when you're alone. Maybe a beginner Capoeira class. No real requirement to socially engage if you don't want to, but warms your heart nonetheless.
And maybe one usergroup of some sort once a month. No need to engage with people. Worst case, you just listen to some talks and get free Pizza.
One thing that's very important in Germany when getting help is to never EVER say that you have suicidal thoughts. The moment you do that you slide into a bracket out of the social system that you can never get out of on your own. Any doctor or psychologist may now force you to take medication or put you in the asylum whenever they chose.
