Relapse longer

Im struggling with false memory pocd sexual what if thoughts. I discussed it with three therapists. Did CBT and ERP. Ive been free of this intrusive thoughts for 11 months and now its back and i feel like at square onewith doubt. Redoubting things ive already did therapy on and disproved. I felt inner peace and fine for almost a year and now back to feeling stuck ruminating questioning whats real memory and whats false memory even though deep down i kmkw its false memory i have evidence against the thoughts and its so ego dystonic theres no proof as my therapist said.

I've been doing well the past month in cutting down on compulsions and have been feeling better however, last night I had a set back that carried on into today. I had gotten very poor sleep (4ish hours) and then something triggered my memory. I think with the sudden anxiety spike and lack of sleep I didn't have the strength to ignore my compulsions. Last night and today I've realised I've gone back into rumination and mentally reviewing the event excessively again and comparing my situation to other people's, but most of the times that I start going down these rabbit holes I don't even realise I'm doing it? Also been fixating a bit on the fear that I've ruined my progress and that I will fall back into the deep end of it all again, that I have done so much work getting myself out of, although trying my best to not be too discouraged. Does anyone have any advice on how to deal with rumination more specifically?

I’m a teacher, and for the last two school breaks, my harm OCD spikes regarding my girlfriend. The first one was winter break (It came back after three years), and when I was recovering, it came back in the beginning of June. Just out of nowhere. Even though I know it’s OCD, it still scares the hell out of me and I spiral for weeks and weeks. Does anyone else have spikes and relapses when there are breaks in your routine?