My husband has had autonamic dysfunction for 20 years and recently his heat stopped twice.  Once at home the other in the hospital.  He is so tired and weak and sleeps a lot lately.  He also has shortness of breath.  His doctors said his heart is getting weaker.  All blood tests are normal.  What could be causing this?Thank-youB.Finley
Hello and thank you for using Chat Doctor. I carefully read your question and I understand your concern. I will try to explain you something and give you my opinion. Weakness can come from different reasons. They might be cardiac, metabolic, endocrinoligic causes sect. To cardiac problems I would mention heart function or rhythm problem. If a person has a low cardiac output, meaning an insufficient heart and if he is untreated he might feel week and have different in breathing deeply. Also, heart rhythm problem might house weakness. Low heart rhythm, heart pauses or electrical system problem might be responsible for weeks, fainting etc. Electolit imbalances, thyroid gland dysfunction also might cause such symptoms. So, if I was the treating doctor I will recommend some examination like a cardiac echo to evaluate heart function and walls, a full blood analyze to exclude electrolyte imbalances, anemia, hypothyroidism and a holder rhythm monitoring to see your rhythm tendency during day and night. After all this we can better judge how to treat the problem. Hope I was helpful. Best regards, Chat Doctor.