Sailorgal,
This is sounding really really positive overall, and wonderful to hear that things are mostly on the upswing. Pain is such an incredibly complex thing to live with. In all the years that I've lived with it in various forms what I've discovered is it does both... It both raises your threshold and it lowers it at the same time, if that makes any sense. Yes, like the system is getting fried is a good way of describing it. Interestingly there are things I used to enjoy that I can't tolerate any more, like music that is too loud or too "complex", I am very quick to startle, and most of the time I can't even stand the t.v., strong smells, extremes in temperature (weather...especially hot weather), or even clothing that isn't absolutely soft and comfortable. It just made me laugh because given my extremely limited diet, my life mostly in one room, in silence, i'm sort of a monk in my cell!
I recently read a really good book about pain called "The Pain Chronicles" which delves into chronic pain, the ways researchers are trying to better understand it, and being written by someone who has chronic pain herself it offers the perspective of someone who is on the inside of pain who is trying to understand it better.
Funny you should mention a brutal menstrual period. Just coming off one myself. It isn't all that unusual since I also have endometriosis and ovarian cysts, but this one was especially bad. Nights of just feeling my whole lower body twisted into unending contractions and knife like relentless battering pain for days. And naturally none of this did anything good for the fissures, so I'm pretty exhausted now having to deal with the wreckage "hurricane period" left behind. You know, sometimes it amazes me what a body will continuously endure, that the pain itself doesn't kill you outright, that even in the night when you're convinced this is it, I'm not going to make it this time I'm just too tired out, the fact is you do make it, you're still breathing whether in that moment you want to be or not.
Hopefully with things settling down in your body with the fissure and as you gain more confidence and have less mental focus on the chronic pain and the anxiety of recurrence, your system will downshift and things will calm back down again. I'm really glad that you have plans to do something so relaxing and enjoyable that will give you some different scenery, different kinds of input into your body and mind with your upcoming trip. I think the value of these things can't be underestimated in the healing process.
I pray for no setbacks for you too. Onward!