

First of all: As a healthcare professional but not your healthcare professional: What you describe has strong signs of a depressive phase and you should first and foremost seek professional help - don’t trust the internet on this and more importantly don’t start to self treat yourself in any way besides behaviour based measures.
Secondly: It can take ages. I’ve been there. Especially when your new job is similar to the old one it is quite difficult, as you “in theory” know what to do but in reality you still have to find your place in the new company. It will take time. But it will get better.
Nope. You can’t.
Brandenburg only has extended and codified the “taking an interruption of your travel” (Rast) into their nature laws - and you must leave after one day. You are only allowed to use it minimally and e.g. make no fire,etc. And even then you need permission from the owner - which the state doesn’t usually grant for their woods/grounds.
In Schleswig Holstein it’s totally forbidden besides the “wild camping spots” - but these are just more “wild” campgrounds, similar to what you find in US national parks. And cost money,btw.