elevated calcium, very low PTH, high albumin/globulin ratio & vitamin D deficiency

First of all, thank you for your help. For the past 6 mos, my 20 yr old son had been complaining of leg bone pain, sore muscles, extreme fatigue, dry mouth/dry eyes, tinnitus, symmetrical or bilateral pain in wrists/ankles, numbness/tingling in hands/feet.

He can't walk more than 10 mins w/o having to stop and sit down. Good news is that ever since he stopped taking a tinnitus supplement which the ENT recommended, my son no longer needs Mobic (NSAID) for pain relief. He still has pain & fatigue but not enough to warrant the use of Mobic. Still, his symptoms are worrisome because they don't go away. His endocrinologist suggested that he take 1000 IU's of Vitamin D3 per day and after several weeks, my son still has mild aches 'n pains along w/fatigue. He did have low B1 & B12 in his blood test but ever since he had been taking B1, his B1 & B12 blood test normals resumed back to normal readings. It's his other blood test numbers that are out of whack and how do we correct them? His Albumin/Globulin is 2.4H (normal is 1.0 - 2.1), PTH is 6L (normal is 10 - 65), calcium is 10.4H (normal is 8.6 - 10.2) and Vitamin D is 21L (normal is 30 - 100). We've been to 8 specialists and no one can diagnose him. Autoimmune disorders (incl. Sjogren's Syndrome), neurological/muscular disorders, RA (rheum arthr), etc. have been ruled out.

Salivary gland biopsy was normal/negative. Brain MRI & white brain matter was normal/negative, MS was ruled out. Chest x-ray ruled out lymphoma, hands/feet x-rays were taken and normal. Lyme Disease, HIV test, etc. again, all normal. Please help. Thank you.

Any input or opinions are greatly appreciated.