Hi, I have been experiencing swelling on my left shoulder (in the neck region) and there s what appears to be a swollen gland in my left neck. The headache is mostly on the right side of my head and breathing is sometimes correlated with irregular heartbeats. I am on HBP medications, but the docs have done tests (ultra sound, EGC, xrays, biopsy) for thyroid, but all are negative. What could these symptoms be and what are the possible treatments?