The important thing is you're doing something about it now.
*I'm not a Dr* but I do have high blood pressure and I suffer anxiety attacks from time to time.
It can feel very frightening, and it can mimic what I imagine a heart attack might be like...but it could be this is anxiety, too.
Pls do call your Dr tomorrow or someone or somewhere sooner if needed, but try not to worry too much, ok?
D