I too thought I was going mad, with palpitations, the dizziness, whooshing, itchiness, you name it I got it.
What I have found though is that cutting down on the caffeine and chocolate will really help with the palpitations. From a heartbeat of 130 one time in A&E mine is now down to 70-80.
The dizziness I have also found to be associated with low blood sugar, so try and eat regularly and stay off the sugar if you can, it all helps.
I really feel I am not going insane now or have some incurable disease - that's until another symptom crops up that I've never had before of course!
Thank you