I'm Expierancing Stomach Pain That Radiates From Lower Back, Around

I'm expierancing stomach pain that radiates from lower back, around to front (both sides below ribs). This pain prevents my from walking or running without considerable pain. Also I fee that I've lost considerable leg strength. Back pain started 3 months ago, side & front stomach pain 30 days ago &leg weakness 1 week ago. Also have had a considerable increase in burning throat reflex pain