The advice you've been given is correct. I've had Osteoarthritis since my 20's I also have a Degenerative Cartilage Disease in my joints that compounds things.

For Osteo, you must stay mobile, exercise in safe ways, like in a pool is best, where you have no weight on the joint. Or simply walking at a comfortably pace on a Treadmill.

Bone health is key, getting plenty of Calcium and supplements like Chondroitin and Glucosamine. There are several brands that put them together like Osteo Biflex.

Ibuprofen or other NSAIDS are the medications used for Arthritis pain. There is a Long Acting version called Mobic but you'd have to get a prescription and it doesn't work much better than just regularly taking Ibuprofen throughout the day.

Heat helps a great deal, using a heating pad at night, soaking in a very, very hot bath once a day or more if the joint is aggravated.

But staying active, eating a healthy diet, including bone healthy supplements, taking Ibuprofen and using heat....that's how you treat Osteo.

The more you sit around and are inactive, the more the joint will stiffen and the pain will be worse.

I am finding that 500 mg of turmeric (curcumin) twice a day is fantastic at reducing my pain. There are many diet related things that may or may not make a difference such as avoid nightshade foods and oaxalic acid foods. I find alcohol makes my arthritis pain worse (boo hoo). Hope you find relief.

Yes, oxycodone helps and anti inflammatory, like
Naproxen