Jenny, I really feel for you!
I also stopped HRT three weeks ago, due to bleeding and pain.
Well, Christ it feels as if I am dying a slow painful death!
Going cold turkey isn’t a good plan in my experience.
Could you not have tapered off slowly? The body has gone into shock, hence the symptoms returning with a vengeance.
I don’t have much faith in supplements, but sage tincture can be good for sweats. Vagifem or ovestin is good for bladder.
Maybe try red clover or soya isoflavanes?
Clonidine as Taz has has mentioned, can be good for flushes too.
Best of luck, it’s miserable I know x