How To Cure Dull Pain In The Lower Left Of The Abdomen?

for the last three weeks i have had a dull pain in my lower left abdomen area ...i am type 2 diabetic ..i have had normal bowel movements and no signs of blood in my stools ...it hurts more when siting down ...the pain is two on a scale of ten ...sometimes my lower back hurts when sitting down ,,,,ice makes it feel better or a heating pad at night ...i don t feel any lumps ...my urine is fine... no pain urinating ,,,I DONT HAVE HEATH INSURANCE //MY COMPANY DROPPED OUR COVERAGE ....i have avoided going to a dr if there are expensive tests or even an operation needed ///...i do some physical work lifting boxes at work ...I am 56 years old ....maybe i pulled a muscle ...but this has been going on for three weeks ....i use a heating pad at night when i sleep ...and that helps for the next day ...but by the end of the day ... i get the dull pain back in my lower left abdomen....where my belt comes around ...but just lower ///