<human>: I am feeling shaky almost nervous. I get dizzy very easy. I am tired all of the time. I am thirsty all the time. My head hurts a lot. I had heart surgery in 2008 for aortic regurgitation. Two months ago I was hospitalized with chest pain and they kept giving me potassium. I need help
<bot>: Hello! Thank you for asking on Chat Doctor! Regarding your concern, I would like to explain that many disorders could cause this clinical scenario. I would recommend consulting with your GP for a careful physical examination, a resting ECG, a chest x-ray and some blood lab tests : - complete blood count for chronic anemia-kidney and liver function tests - blood electrolytes (including calcium and magnesium)- thyroid hormone levels and cortisol plasma levels (to exclude possible thyroid and a Chat Doctor.  -inflammation tests (fibrinogen, PCR, sedimentation), because an autoimmune disorder could mimic such a clinical scenario. -blood and urine osmolarity (this test helps define the cause of your thirst)I also advise monitoring your blood pressure in both sitting and standing up position. A head up tilt test is necessary to exclude possible orthostatic hypotension. Hope to have been of help! Best wishes, 