Pain in left trap for years now. Please help!

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I have had pain in my left trap for a little over 5 years now, it also sometime radiates to my upper trap. I've been to all kinds of Doctors (orthopedics, sports medicine and a chiropractor) and no one can seem to help.  I have tried RICE, I have tried stretching my pectoral muscles but that only seems to irritate my traps more after i have done the stretches. A few months ago I tried working out and the left side of my body, especially chest and upper back, were much much more sorer then the right side. When I did shrugs there was a popping/clicking sound in my left upper back area. I did play a lot of golf a few years back and thought it was a rhomboid strain so tried to treat it as it was that for a few months. Also, I am not flexible and my body seems to be extremely tight so, i thought it was my pec muscles and have been stretching them out for months now but have not had any pain relief from that. Finally, I do sleep on my left side and been trying to sleep on my back the past month. Please, if any one has any information on what it can be or what I should do. any info would HELP!