Consult a doctor first if that’s cheaper than buying a whole new mattress.

I go back to the joke, specifically when House did a similar joke when he was in clinic:

Patient: Doctor! When I bend over like this bends over, and I move my leg to the right like this twists leg to the right, and I take my palm and do this takes palm and presses it against the side of his thigh, I get excruciating shooting pains that go from my thigh to the tips of my toes!

Doctor: So you bend over?

Patent: Yes.

Doctor: and then you twist your leg?

Patient: Yes, like this shows how he twists his leg again.

Doctor: and then you press on your thigh with your palm.

Patient: Yes.

Doctor: And that causes intense pain?

Patient: Yes!

Doctor: And you direly want that pain to not occur?

Patient: YES! Doctor, it has taken over my life, I need it to stop!

Doctor: THEN STOP DOING THAT!

As an intermittent insomnia sufferer who depends on a very specific sleep ritual to actually get good sleep, I feel the pain, but yes... the answer a doctor is going to give is "stop doing that".

The new mattress/fuckload of pillows is some on point advice.