Three month update:
About two and a half months after cessation (a couple weeks ago) I met with a doctor, who told me that everything was hormonal and that gradually my body would readjust to pre-fin state and I would completely recover. Of course, PFS is a very little understood condition by the majority of the medical profession, but the doctor did tell me that he talks to “probably one bloke a day” who is interested in finasteride, and that he had lots of experience of people deciding to come off it, and then recovering after a few months. This made me feel a little better, especially because at that time I had had a sudden improvement in symptoms; one day perhaps two and a half weeks ago, I had absolutely pure clear-headedness, sexual symptoms evaporated, and I felt really great. I remember it was a very hot and sunny day, and I went for a walk and just felt great. I definitely think that hot, sunny weather is important in recovering; I have even started taking a vitamin D tablet once a day because things have been so dour here in England for a couple weeks, cold and cloudy, with the cold especially exacerbating my testicular atrophy, and I just really want to recapture that great feeling of pre-PFS that I had two weeks ago, which I just have a strong feeling must have been somewhat tied to getting lots of sun and vitamin D for that one day.
Unfortunately, since that uptick, I have reverted back to PFS a little, though my erections are now stronger, perhaps 90% of the way back, and my brain fog manifests mainly in slight lack of acuity in vision and memory, rather than, at its worst, an active sense of headache and fatigue. I would say that overall I am 90% recovered from the absolute worst, and I am hoping that what I have will gradually clear up and I will constantly have the state of mind and body that I had for that one sunny day when everything felt great. Probably the most concerning thing I have is that my testicles are still atrophied most of the time, and can shrink massively before I go the toilet; I’m not sure what to make of those symptoms. If things haven’t improved in another couple weeks, I will call the doctor and ask him to schedule a hormone test at the hospital, though I know that would be months away.
The fact that I have some symptoms at this point does technically set me out for having PFS, but again, I’m hopeful things will improve, and I have been resting a lot of hope on what @CO1314 said to me a while ago about how the recovery is constantly two steps forward, one step back, and I hope that I am indeed one of the lucky people who simply get bad side effects but who do eventually completely recover. Best of wishes to everyone.