If you have been experiencing prolonged muscle and/or joint pain, you may want to consider a vitamin d supplement and a blood test to check your levels of the nutrient. While it is far from being a "pain reliever" per se, daily supplementation can dramatically help to reduce inflammation, which may help to reduce the pain if it is being caused or exacerbated by inflammation.

Also, science has established definitive causal links between vitamin d deficiency and chronic pain, fibromyalgia and chronic fatigue syndrome. That said, in light of the symptoms you're describing, I would recommend having a blood test done to find out if you are indeed deficient in vitamin d.

Low vitamin d is a deadly deficiency. It can lead to dozens of diseases and will make any existing condition worse be it pain or something immune-related.