BW it's hard to say what's too much pain. I always felt very ordinary after an EPU, bled and usually was in some kind of pain, to the extent where I often wondered if I was too 'bruised' to be able to go for transfer. I could barely walk after one stim cycle, for 2 days, but with the blast cycle, most of the worst symptoms subsided by transfer day, so don't take how you feel right this minute as the yardstick of whether or not you're going to be 'right' for transfer.

Just keep drinking that water, and if you're on P4 it's probably not helping with the bloating, but rest and see how you feel tomorrow, and the day after that. You might find you'll be feeling better and your worries would be for nothing.