get it scanned, i had a tear in mine for a long time and eventually i got to see a decent physio (NHS one) having tried several provate ones. kept being given stretching, strengthening exercises which were not helping. eventually howard bush, my NHS physio said after just two sessions, you should be seeing som improvement by now and sent me for a scan, sure enough torn.
surgery to fix.
took about 3 years to fix after that coz all my muscles had gone mad trying to compensate over the 18 months – 2 years it took for me to get to see a NHS physio.
All in all the NHS rock, I owe Howard a pint or two and private physios can be a load of rubbish.. but push the doc for a scan asap….
mine felt like just a niggle, and my bigger muscles (lats) were compensating for the movement.
only the can showed that it was a partial tear and needed a repair.
ramble over, but it lost me three good years of training and kept me off the bike for a long time…
Good luck
Andy