Recently lifted something that was too heavy. Now have sharp pain in lower left abdomen. Doc said it was pulled muscle but its getting worse.?

Possible hernia. Your doctor is probably right--a "pulled muscle" may take days to heal, or may worsen if you repeat the behavior that caused the injury. Try a heating pad for this. However, hernias do occur, & may not be readily apparent on physical exam since there are so many different layers of abdominal wall.. A ct scan of the abdomen may be helpful here for your reassurance.