<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have been extremely tired, cant get enough sleep since October. My chest feels like someone is pressing on it with their shoe. I was diagnosed with low d and b. Am taking 40,000 units of D every two weeks and a shot of B every two weeks. I have no energy. I am 61 1 2. Is it just all age creeping up on me?  <response>: Hello rearward welcome to Chat Doctor.come have evaluated your query thoroughly. There are different possibilities for this condition as - low hemoglobin - low levels of vitamins, minerals, trace elements - cardiac origin as valvular problem or cardiomyopathy - stress or anxiety induced psychosomatic manifestation - uncontrolled BP, blood sugar, cholesterol levels - others Hope this will help you. Regards. 