shoulder pain

Hi everyone, I really hope someone has had a similar experience, as my doctor seems a little lost. Around the same time as I started doing bench press to improve my upper body strength for front crawl, I experiences pain in my shoulder which was quite severe. After taking 2-3 weeks off the pain has gone away. However, I now find severe clicking sounds in my shoulder, especially when moving it in a circle. Most disturbing is when making the catch with a high elbow position, subtle pain and clicking resonates in my shoulder and after only 1000m my shoulders feel as though they have taken on 5000m. Thank You!