Ok so there’s a thing called Colyte, thats the brand name. It is a polyethylene glycol electrolyte juice. You can ask for it at a pharmacy, they might have a different brand. It tastes pretty good. Now it’ll get you real cleaned out, so you’ll have to keep eating like some kind of horrific human centipede. Drink lots of water, stay hydrated.
Ibuprofen + acetaminophen at the same time.
Alternate ice and heat in 15 min intervals. You can get an electric heating pad they work well. Lay on the floor to do it.
Get a firm mattress. If that’s out of your immediate price range, sleep on a folded blanket or a mat on the floor. Your shoulders might get cranky, but it will be relief on your back.
Walk.
Bend at the knees for everything.
Light stretching, nothing that puts an unsupported load on your lower back.
Ab exercises. Planking is your friend.