Burning pain between shoulder blades

hi im seth and im new and i feel like im falling apart about 2 and half mos ago i was working and i had a burning pain between my shoulderblades and up my neck and down both of my arms since then i have had a 20 pound weight loss i fear i have pancreatic cancer but without treatment i would have been dead already but i ve seen 2 docs got 8 blood test witch turned up that i have a calcium imbalance and a b12 defiency i also have had a depression and cronic fatiguge syndrome ive also had a ct scan done a month ago witch turned up nothing every doctor i turned too told me that either it would have turned up a primary tumor or metasisis i hoping thats right i dont want to die and i want to put on weight any suggestions of what the hell is going on i've also had an edosocopy withch turned up erosive gastritus please help me out it would be greatly appreciated much love and happy holidays