I can understand your problem ,thank you for HCM Here numbness in both arms and back leads to discomfort and uneasiness to patient I would like to know your age ,any risk factors like smoking ,alcohol habit and any existing disorders like hypertension,diabetes these generally decreases nerve transmission . even in cervical region vertebral compression also leads to numbness so client plz undergo once to cervical x ray ,mri brain if pain persist ,for another 2 days rest to neck region will give good result . ECG, 2D ECHO checkup to r/o cardiac causes .. regular physical exercise and healthy life styles will change the disease plz take b complex tablets till diagnosis comes .. follow up to doctor with reports ..it will subside definitely .