Wow - thats a laundry list you have there man.

Ill keep it short - as its always hard to give a complete response without actually talking to you and asking all I would need to...

1) What sort of weight training are you doing? VERY and I say VERY generally speaking, if you are doing too much bench and have a bad back/shoulder stability sling then your traps will be over active and this can lead to neck/shoulder discomfort. Your shoulder complex is heavily muscular based and joint congruency is reliant on posture. Too much bench press or anterior muscle work and you're going to have problems. I once saw a power lifter that could bench nearly 200kg but couldnt raise his arm forwards as his serratus anterior were atrophied, leading to bad scaps. Be weary of your guy routine... these can be deadly for your shoulders if you have an imbalance.

2) Youre right, we really dont know jack about theosis/itis ideas and the debate still rages. Again - watch the gym work.

3) You've lost your confidence in practitioners - you arent the first and wont be the last. Unfortunately we cant all get it right at times, but you have to look for someone that can clinically reason their way through your condition and not just say what it is... a person that takes a detailed history and listens to your for more that 17 seconds (the reported average listening time for a health care practitioner) is more likely to help

4) As for the R side of your body seizing from ??the hip/back down?? Are you a cricket fast bowler? Have you played recently? When does it get worse and when does it get better?

Sorry, thats a lot of info. Good luck man