Really struggling with Pure O

I have been battling pure O for practically my entire life. A few years ago I sought treatment and I thought that I had everything under control. My OCD reemerged a couple of months ago and it came on suddenly and severely with lots of feelings of depersonalization and derealization. I am so scared and I don't understand what's happening. Anyone else experience a sudden and sever recurrence that you can't get a handle on?

yes at times its worse

ive thought ive had depersolization but guess i never heard word derealization

The worst of my intrusive thoughts made an unexpected return in October and everything got worse from there. Since then I've had some intense episodes of depersonalization and derealization.
I think it's because I never got proper treatment in the first place, and that everything else ties together with my OCD. That's what I'm hoping at least.
I also think these things are worse in the winter.

I completely agree. I always seem to get worse in the winter. Do you your depersonalization and derealization come along with intense existential obsessions? I can't seem to stop obsessing about reality.

Not really, I used to think about those things a lot but I try to avoid it now.

My OCD flared up around October and I've been struggling with it since. OCD apparently goes in waves over the years through out ones life. For me right now I'm preoccupied with my health and getting sick.

As far as existential obsessions. If that includes philosophical thoughts about life and death than yes. I always am aware and thinking about this.