About dry eye n extreme pain. Eye n all!

Hello, I need 1 Help as my Jiju lives in USA n working in IT firm n recently diagnosed with dry eye, extreme pain in eyes , face, neck n back. He has dizziness too. In previous blood test v come to know that he has extreme level B12 difficeincy (97) n vitamin D (13) n doctors gave injections shots n supplements also . Doctors told to take B12 injections life long now he is taking monthly once. His eye oil glands are almost closed like 70% n doctors suggested radiotherapy (4 times weekly once) n laser therapy (4 times weekly once) but post therapy also he didn't find any difference. They told some eye exercises also n he is doing that. Because of work, uncertainty in job n about future he has a lot of stress on daily basis n after this dry eye it has became worse . He couldn't even see screen properly n having neck pain, back pain, numbness in hand n sometimes in leg. His face became very dull , non glowing. He has a lot of stress in life .Pls tell me how to heal from this dry eye n all