Hello
Your main problem is nausea,
dizziness , heart hurts ( according to you ) , heart beat twice ( according to you ).
E K G is normal .
As all these symptoms mentioned by you may be due to .
1 Hyper acidity or
gastritis , as all these symptoms may be due to hyper acidity.
The reason of gastritis or hyper acidity may be fried food , over eating , tension ,
anxiety ( in your case anxiety may be the main reason ) .
In my opinion consult a physician/ psychiatrist and get his opinion.
2 The 2nd reason of such type of symptoms may be
depression .
On the one side you mentioned that there is double heart beat , while in E K G each and every report about heart is normal , so depression may be the another reason .
In my opinion control your diet and avoid fried food , fatty food , spicy food .
Consult a psychiatrist and get his opinion.
Good luck.