Hi
Welcome to the MedHelp forum!
If along with weakness and tingling (near the shoulder) in the left arm there is neck stiffness/pain, then it is most probably pinched nerve. This can happen due to overuse of computers, work involving straining of neck, herniated disc, canal stenosis, bone disease, spondylosis, poor posture etc. Use a hard bed to sleep. Avoid a pillow. Roll a towel and place it under your neck while sleeping. Initially this will be uncomfortable but with time the acupressure will do wonders. Use an analgesic cream or spray. Anti-inflammatory drugs help. The treatment is to remove the compression. You have to discuss the best treatment option with a neurologist, which can range from medication to physiotherapy to traction, cervical collars or even surgery.
Alternatively you can visit a chiropractor or a physical therapist and learn some exercises which you can do to relieve the compression.
If this does not help or if you even have discomfort in the chest then despite your age I would say get an EKG.
Hope this helps. Do let me know if there is any thing else and keep me posted. Take care!
thank you for posting. i thought it may of been a pinched nerve but i wasnt sure. ill have to make an attempt to do all the wonderful things you suggested. i hope it helps. oh and im going to make a post about somthing that is going on with my mom and the doctors are not sure whats wrong. maybe you can help me out?