I have had similar problems since I was 40 and they are still ongoing and worsening as I age. I was diagnosed with fibromyalgia years ago and also sjogren's syndrome. I'm not sure if the fibromyalgia syndrome is correct as I can stand deep massage fairly well. The massage is very painful but I find it helps, also ART therapy is a huge help. They have a web page if you want to find one in your area but look for the amount of courses and training the therapist has taken. You want one that is up to date with all the latest techniques and one who has covered the whole body and not just areas.
I also feel that my pain started when I was a fitness instructor and over used my body with repetative movements. I still like to go to the gym but right now I am in too much pain. I do walk a lot. I also have had a course of prednisone this week to take down the inflammation and I had one half hour visit with the Active Release Technique therapist. He tried a latest piece of training that he learned recently and he helped tremendously with the pain going into my groin and down my leg from my back. My hip x-ray shows only mild degeneration in my hip but I have various degeneration in my back. I am now 78 but not at all overweight.. I have also been told that I have tendonitis in my shoulder and groin etc etc.
I will give the oregano oil a try. Do you drink it or rub it on the skin?