It could be related to many things.
Call you doctors office and tell them exactly what you wrote here - dizzy/sick/fast heart beat.
My guess is they will tell you to come in right away or go to emergency. ( don't drive yourself- dizzy)
Don't get scared about it. It's a routine check out in an emergency room. The big thing is that you don't want to put it off. If on the off chance it is a heart problem - damage is never repaired. When you go in can make a huge difference in the rest of your life.
Don't worry about it being " nothing". There is only one way to tell if it is nothing or not and it is far better to be told it's nothing than ending up very, very sick for the rest of your life or dead.
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