Back pain with inflammation at 20 weeks

Aashka
Hey ladies,
Anyone been through the same situation? Currently 20 weeks pregnant and was having sudden extreme back pain on lower right side. First thought it was kidney stones and got tests done, came back negative. Doctor was unable to figure out the reason for the pain and concluded it as musculoskeletal pain, told me to take tynelol ultra strength on onset pain, and since then, taking almost 3 tynelol daily. But waiting for it to heal. Anyone else been in the same situation? How long does it take to heal? Any other remedies that would work? Worries that just made halfway through and if the pain continues for the rest of the pregnancy, it is going to be very tough for me to go through. Also, am worried about taking so many tynelol daily, it may hurt my lil one. Thank you all in advance !