Your pain could be due to a number of problems.
Pain in Unilateral leg & Upper arm, - could be due to either vascular or neurologic causes. You need a physical examination to rule this out.
Dull pain, which is reproducible by pressure on affected site, which is NOTassociated with redness
or loss of function & which does not affect sleep is mostly benign and musculoskeletal pain
Try OTC painkillers like paracetamol
- in case of musculoskeletal pain.
Hope this helps.