Dizziness and palpitations.

In the uk the last few days not today as it’s cool here in north east of the uk but when it was hot i started to be dizzy I had one spell that was it, then the palpations but not straight after, I haven’t been dizzy for ages, then palpations which I haven’t had for years. Going to get appointment at doctors.
I also haven’t been sleeping well due to the heat.