Hi RubyJames and welcome! So sorry you are dealing with pain and discomfort. I've dealt with low back pain from time to time over the years but never attributed it to anything connected to my TAH/LSO. I'm a mid-distance runner, so most of it has come from the running.
Though recently I had just a slightly sore back for no reason. There were a few things going on, but at one point BubbaQ and I both thought we were reliving something from my pre-hyst days. My brain refused to connect the dots, but i made an appointment with my

. I'm a week post-op now having had a good-sized fibroid removed. Recurring fibroids were the reason for my hyst, and in hindsite all the signs were there, but I figured they were from any number of other things.
Backs can be delicate and tricky. I would definitly visit a doctor, if you suspect its related to your hyst, visit your gyn, if not your GP or a chiropractor.
For me, when the pain doesn't go away after a couple days, it's time to seek treatment.
PS as a runner, sometimes the solution to my knee or back pain has been as simple as changing my shoes