Same here Fanny, I also get prickly heat, or used to. I discovered that it was due to me using cheap suncream that clogged up the pores on my skin. I now use Piz Buin, and its fine now. Touch wood.
Swollen legs, prickly heat, bitten to death by mozzies - what are we like. Still I wouldn't swop it all for Blackpool in a million years