Quick, while no-one is looking....
I've been having this for a long time, at least eight years. It starts on the day I start bleeding, when I wake up. It feels like a combination of a red hot poker and a massive muscle spasm. I start cold sweating, my head throbs and I try to ride the pain. If I can catch it quickly enough, and by that I mean going to the loo, it stops at that. If I don't, the pain stabs through my whole lower half. Agony doesn't really cover it.
The intensity of pain increases with how heavy I'm bleeding, and stops once the bleeding stops and I start my next packet.
The only advice my doc had a few years ago was to run my packets together, which I did do to decrease the frequency of incidents.
The fissure issue may be a red herring, as that seems to be more recent. But it may all be due to the fissure, which is known to be the third worse bowel pain you can have, after cancer and suchlike.
Frankly, I have no clue. For a time I worried it might be endometriosis, given the link to the bleeding. If it was the fissure, wouldn't I get the pain throughout the month?
To be honest, I'm going to have to go back to the docs. I'll see what happens this month, but it's been pretty bad the last few months.