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 rotator 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!).