They do say dehydration makes BH more intense so it could well be that. Make sure you're drinking plenty hun, specially as you're just getting over a UTI.
Good luck at the MW tomorrow, will be interested to see what she says about the dizziness coz I keep getting it too, there's been a couple of times when I've really thought I was going to faint! Feel better soon and don't forget to take it easy, let OH help himself up, he'll manage eventually, even if it takes 3 times longer than usual!