Diziness vision change forgetfulness.

Sir/madam I'm divyansh gautam facing health problems it starts with racing heartbeat and fear after i did ecg it comes normal so doctor told me that you're normal but the problem not solved after few day again i go to doctor he told me to do ecg it again came normal after that he preferred me CBC LFT RFT THYROID TEST AFTER I DONE IT ALSO SHOWS NORMAL VALUES SO HE TOLD ME YOU ARE NORMAL BUT AGAIN THE SYMPTOM STARTS LIKE RACING HEARTBEAT AND SHORTNESS OF BREATH I HAVE DONE CBC TEST SO MANY TIMES BUT REPORT ARE NORMAL HB IS 13.8gm after that I have stomach pain so doctor preferred me endoscopy but in endoscopy it shows GERD and now I don't have any problem with heart beat or stomach pain but I have dizziness problem and feeling like m I'll and no diagnose of my illness and I'll gonna die I am facing problem now like 24/7 dizziness forgetfulness like my brain is not working but I had MRI BRAIN amonth ago it shows normal help me out doctor 🙏