Thanks for the input, but after reading up on that, I doubt it is that. The pain doesn't exist any more, it was only a few days worth initially, now it's just the loss of strength - whatever happened seems to have impinged on a nerve more than anything and thereby affecting the serratus anterior. I don't appear to have lost any strength in the fact I can still comfortably do chin ups, but the complete opposite movement I simply raise my arm up and hold it overhead without the trapezius appearing to do all the work, and then I'm leaning to one side to keep it there. It's literally that type of movement that I can't do, anything else seems fine. I still swim although it too a few weeks to even attempt trying front crawl. Now I can swim ok but can feel some fatigue in the shoulder - I'm also beginning t think that swimming with a damaged shoulder may have compounded the issue and the lump I can feel could well be built up muscle at the anterior of the trapezius but directly behind the clavicle, it seems to far up for it to be anything connected with the pancoast syndrome. I think I've somehow caused trauma to the nerve area and in it's natural healing process, formed a protective area that has now not rectified itself. Doc's is the only choice now and unless they specialise in this it's going to have to be a scan / x-ray.