I had that. Soaked the bed about 6 weeks in on 250/wk. I was holding a heap of water. My crazy doc told me to eat a lot of salt. I think he was wrong.
Lower your sodium and maybe try some Arimidex if you're feeling bloated. Can't say for sure but that's my best guess.
Edit: I've been a light night sweater on and off for years, but this was a whole other level.
Hang out for some more experienced guys to answer.