Plz help!...my left arm is paining badly since 4 months.i had not fallen anywhere nor given pressure to hand.the intensity of pain is lessened compared to first month of pain,but it is still paining,.there is no constant place of pain in left hand. then tingling pain goes to fingers,then palm,arm,elbow,shoulder...of left hand.pain comes and goes.iam scared.my right arm also pains sometimes.iam underweight.i also lost 4  kgs in these 4 months.i had some dietary changes and started 30 min walk.what could be the reason for such pain?..could it be sign of something major?