Yes, it's very hard; but you have to work with it all and get the bad stuff out of there. Like working on cleaning a wound if you're medically inclined. It hurts when you have to scrub a wound but it's necessary to get all the dirt out, not just "most of it" or it will get infected.

Trust "yourself" to know when to rest. Your body will take time off if your head is not able to. All things ebb and flow, feelings, thoughts, ideas, sleep :-) Hope you get some rest soon.