OP I suggest high strength Krill Oil. It's the simplest thing you can do and think it will help you.
Many years ago 10 or more I took fish oil but thought I got use to it and wasn't helping any more so gave up. Years later had a back injury multiple surgery's ending with spinal fusion with a lot of extra work done with that. Still healing 3 years later.
Prescription meds were killing me with side effects and not helping pain so after getting off those against advise and incredible withdrawls got onto high strength Krill Oil 6 caps a day minimum and I'm doing much better, back pain now is more about weak muscle and a bad knee I thought would stop me cycling for good feels 100% cured. My left foot that's fused together feels fixed, my left shoulder and thumb joints (arthritis) are all good now and energy is building, walking 5km every night.
I only started Krill 1 and a half months ago!! Worth a try I think?