I can understand what is happening with you. From the description that you have given, it appears that you are having a typical panic attack
many times a day and obviously you are distressed by it. Panic may or may not occur with a stressor and generally resolves by self without any treatment. If you are not convinced, you can get a holter ECG 24 hr recording and you will have nothing but a tachycardia
on the ECG. The other way to confirm it is start yourself on a course of benzodiazepines such clonazepam
and you will have a significant relief in your problem. Panic disorder can be treated with SSRIs and cognitive behavioural therapy. Do seek the help of a psychiatrist
Hope I am able to solve your concerns.
have a nice day.