Broken rib (LHS). Failed to dodge a turning kick from a flailing green belt. Missed 1.5 days of work and three weeks of training. Assumed had hurt shoulder doing reverse hammerfists. X-rays for the next injury showed a callus on the third rib. At least that explains the surprising amounts of pain, inability to reach and total failure of manipulative physio to help in any way whatsoever. Popping sensations felt during physio should be reported to physio. I have learned this lesson.
Find a physio you trust and like. Mine completely failed to notice that I had broken a rib and was working with the theory that my AC joint was subluxating. The sticking and popping was most likely the broken rib moving around.
Training wise - Block only as quickly as the kick comes towards you. Remember to dodge. Remind over-excited colour-belts that you are out of practice and to take it easy. Beating me up isn't buddies.
Adrenaline is not necessarily my friend. This is the third decent injury I've received while sparring that I've completely failed to notice until I've cooled down (figuratively and literally). I need to learn to recognise pain as a negative response while I'm training and competing and STOP.