I am having tightness in my chest but no trouble breathing. I am also extremely tired and weak with no appetite ( and nausea upon eating ) and extreme thirst. I am also going to the bathroom more frequently with urination and lately more loose bowel movements. I feel as though my heart is beating out of my chest ( I have been diagnosed with tachycardia ) and my eyesight keeps going blurry can you please help me? What could be going on? I am also epileptic, have asthma, and hypoglycemia