like i have mentioned before, it is unlikely to be a tear but you can't be certain without an exam.

The clunking is probably a bicep tendon flicking.

An realtime ultrasound (U/S) can see this happen.

Don't stress about the complicated stuff. Get assess properly, it is likely something common like a muscle imbalance. You will likley have to do the GIRD stretches and some Wikipedia reference-linkrotator cuff strengthening or something working into the range that you have the clicking happening.

You'll be fine. Otherwise, book a flight and come see me (there are STACKS fo physios in the UK who should be able to help you by the way!).