47 Y/O Male.  The end of June I started having upper mid back pain...burning, decreased range of motion of neck, and then i started to have muscle twitching over different areas of my body. Deltoid, thigh, forarms, calfs, sometimes the back.  They bounce around and are not in the same area.  Rest seems to help.  No weakness and reflexes are normal.
Dear friend as you have said the pains are bounces around and there is problem in reflex action I, from my experience as a clinician, must say you don't have any serious problem. Certainly you have a fatigue AOR pain all around your body part. This can be due generalized fatigue syn Chat Doctor. Alsoyou should go for a simple biochemical test for serum sodium, potassium.a mild disbalance causes our muscles get fatigued frequently. So, a conservative approach towards your affected group of muscle with necessary investigation will clinch the diagnosis. Thank you.