Arthritic knee with shooting pain only at night

Betty, have you tried a long pillow between your knees and long enough to reach from thighs to feet? If such a pillow is the right thickness it can keep your 'top' leg, knee, and ankle nicely parallel to the lower leg, knee, and ankle.

I've been taking strong painkillers daily for many years (arthritis). I find green veg and lentils made into dal (sometimes the greens get chucked in the dal too) deal effectively with the constipating side effects.

Also dried fruits and the common root vegetables: carrots, turnips/neeps, parsnips, which I roast in the oven with some sliced onion and sometimes chuck some grated cheese onto, plus a sprinkle of large-size porridg oats

You have my sympathy Betty63. If it were me I would try the pain killers and see if I could eat enough fibre to counteract the side effects, with plenty of fluids, and the occasional resort to senna. The only other suggestion is to try a TENS machine. Hope you find some relief.