Chris: Yep, certainly takes discipline. Oh, and good to see you posting again .
I tried a single dose (15mg) of mirtazapine yesterday night. I'm not going to make any statements wrt effectiveness yet, just wanted to say that so far, it hasn't affected my HPPD as far as I can tell. It did make me extremely tired, though. I slept well but awoke feeling exhausted and felt 'zombiefied' for hours. Upon returning from university I fell asleep again and awoke late in the evening. One of the possible side-effects is strange dreams. I had some pretty strange ones while napping, but then again, that's not too unusual for me.
I think I'll postpone giving it a real try for another week, until I have some more time on my hands.