Middle of spine slightly hurts to touch. hands go numb for the past 3 years when laying on my side but goes away when i lay flat. do i need surgery ?

Not necessarily: It really comes down to the specific cause of your symptoms. Numbness in the arms is usually either from a pinched nerve in the neck, a peripheral nerve entrapment syndrome such as carpal tunnel syndrome, or a neurological condition such as a neuropathy. A detailed exam and appropriate studies can usually determine the cause. Consider being seen.