Pain in the middle back

Hi..im in my 22 weeks and i had pain in the back..its not my lower back..its the middle part on the right side..tried put hot pack but subside for awhile..i can't sit too long and stand too long..even lying down i feel the pain and i need to move slowly as a sloth so that the pain will not hit my back..and when i raise my right hand i feel the pain on my back..anyone experience the same thing? And what did u do to lower down the pain..? Or can i eat painkillers?