Get a new mattress.
Thing is too soft as it is.
try sleeping on your side with a pillow between your knees...
believe it or not, most of these aches and pains do moderate over a few weeks...
My wife has had two knee replacements. They weren’t an “E” Ticket Rides to have done, but they’ve made her like a new person. Get a good Orthopedic Surgeon and he will probably have you have an MRI or a CT Scan. These diagnostic tools are excellent and their resolution will give the doctor an absolute picture of the joint. BTW, I am told that hips are much easier than knees if that’s any consolation. The hip is a much less complex joint. But don’t wait, none of it gets easier with time.
>>>Get a new mattress<<<
Did you mean “Mistress”? LOL