Thanks for your question on Healthcare Magic.
I can understand your concern.
No need to worry for major heart or kidney disease because your ecg and blood reports are normal.
By your history and description, possibility of GERD (
gastroesophageal reflux disease) is more.
It is due to laxity of gastroesophageal sphincter. Because of this the acid of the stomach tends to come up in the esophagus and cause symptoms of nausea, vomiting, chest pain, tightness, pressure etc.
And this GERD is mostly due to stress and anxiety. These stress and anxiety gives you
shortness of breath, clumsiness, dizziness etc.
So avoid stress and tension, be relax and calm.
Consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on it's solution. You may need anxiolytic drugs too. For GERD take
pantoprazole and
domperidone tablet.
Don't worry, with all these, you will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.