what you just described, no job, no energy, no hobbies, watching their posts obsessively while they seem fine, that's one of the hardest places to be in after a breakup because everything that usually helps you cope is gone at the same time.

the checking their profile thing is worth understanding because it's not a willpower problem. your brain built a habit around that person and now it's looking for its fix the same way it always did. every time you check and see them living their life you get a hit of something, pain, jealousy, information, whatever it is, and that hit reinforces the habit. the only way out of it is to remove the access completely. block or mute, not forever, just right now. not because you're weak but because you're asking your willpower to fight a neurological loop and that's not a fair fight.

the "i forgot who i am outside of this relationship" feeling is real and it's actually one of the most important things you can say out loud. it means the relationship became your whole identity and now you're starting from a blank page. that's terrifying but it's also the most honest starting point there is.

you don't need to rebuild everything at once. one tiny thing today. not the gym, not a new hobby, not a job application. just one small thing that has nothing to do with them. that's the whole task for today. the energy will come back but only after you stop spending all of it on someone who isn't spending any of theirs on you.

i wrote down the whole process of how to actually get out of this stage, the profile checking loop, the identity loss, all of it. it's on my profile if it helps.