<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi im 25 years old and have always thought there was somthing not quite right i have a number of on going problems which are getting me down...im under weight, i feel sick a lot and loss of appetite, seriously tired all the time and thirsty, heart palputations, shakey, always cold, i get diahorria every day, no energy at all  <response>: Hi, I have gone through your question and understand your concerns. I suggest you should have complete check up Physical examination and labs testing. If I am your treating doctor I would like to have complete history of your symptoms and tests like CBC, Lfts, Rats, ESR, CRP,CXR, USG ABDOMEN, Stool RE, CS, contour and HIV rapid testing. By than you should improve your intake of protein and healthy diet. Hope I have answered your concerns. If you have any query do not hesitate to ask. Wish you good health. 