Sorry to say, this sounds like the nexus of probs I've been having for the last years or so. No Voodoo, sorry, but I've been treating each element separately: i.e. the eccentric loading exercises, well documented elsewhere on this site, for the tendonitis, and sports massage for shoulders back and supraspinatus. Not to poo on your pile but I'm only just starting to get on top of this after a year. Though admittedly I did leave the tendonitis until I couldn't pick a paperback up pinch grip without out wincing.
The sports masseuse I've just started using did point out the importance of loosening up the supraspinatus to allow the biceps to work over a greater range, which made sense to me.