Question: For the past week now my heart has been pounding really non stop

For the past week now my heart has been pounding really non stop. I can’t even sleep with it like this. I have been getting like little short pains in (my left side) of my chest, arm, leg and foot. I’m also have been feeling my arm and leg get more tingling feeling in them. Also I’ve been getting dizzy whenever I’m up or even laying down. I’m terrified. This doesn’t feel normal. I had Kawasaki disease (don’t know how to spell it) when I was little (around five) and I had to have a lab made plasma for that but they did save me and said I should be ok.
I don’t know if this has to do with what’s going on or not.
I did get my heart to slow a little bit last night but then woke up with it pounding where I thought it would pound out of my chest or something
My mom thinks its all in my head. Its not. This is very terrifying for me ):
Hope someone can help





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