Iam 62 Year Old Male. Got Sudden Severe Upper Body

iam 62 year old male. got sudden severe upper body aches and pains. Pain initially began behind right shoulder blade but has moved up right shoulder and down right arm. Feels like knife stabbed through shoulder blade through to chest. Doesn't go down left side arm. Now began tremors in both arms and hands. Light headache. Low grade fever. Diagnosed with Bell's Palsy 3 weeks ago. Bell's palsy on left side of face. Went to ER last night They xrayed my back. No visible problems. Prescribed muscle relaxer that isn't working much, I am a diabetic.