I would be very surprised if the cells would start to feel like they're dying, especially not so soon after CK. Might be some swelling of the AN? I had a full ear sensation after CK for about a month, but not that severe. Shrinking of tumour can happen a good while after CK, depending on the protocol. Some shrink after six months maybe, mine only shrank a bit now after two years.
As for the trouble thinking and loosing interest in life and being productive, i KNOW! I had exactly the same thing!!! I felt like I was really loosing it big time, just couldn't comprehend stuff that wass going on around me. VERY scary. It lasted like that for a while, but it gradually got better, over time. All I can say is from personal experience: what helped me the most is accept the eefect, adjust to them and the new situation, reduce the workload temporarily, and hope like mad that things would improve. I slowed down dramatically! It worked!! Now, I'm back to normal, more or less, better than before CK.
hang in there, remember, we may have had the non-surgical option, but it is still a MAJOR surgery, and the body needs time to recover. Stress and even depression would be quite normal I would think; someone even suggested Post traumatic Stress Syndrome. Wouldn't be surprised.
All the best, take care of yourself.
Sam, that could be tinnitus too. Not all tinnitus is constant, it can change pitch, type, frequency and even vanish and reappear, as far as I know.