Random pulsing but brief pains on the bottom part of my arm, sometimes extends to hand.sometimes stays in shoulder area.what is that? thank you

Shoulder problem: Shifting discomfort shoulder, forearm ; hand suggest shoulder disorder, with impingement of ulnar tract of brachial neurovascular structures. Absence of neck pain is significant. Constellation of symptoms suggests thoracic outlet syndrome (tos). Chronic low back pain ; femaleness might be clues to joint hypermobility syndrome ; fibromyalgia. See brighton criteria. A neurologist can diagnose.