I've had bad cases of OHSS twice. Both times I wasn't able to transfer and one of them had me in hospital for a week and off work for over a month. Both times I started to feel a bit better after 8 days when AF started. It was early because I had no progesterone support due to no transfer. It took a few weeks after that for all the fluid to finally go away, though.

Third time - I got mild OHSS which developed after I became pregnant. I still had pain from the OHSS at 15 weeks pregnant and it was difficult to tell when the fluid went as by the time the bloating had settled the baby bump was taking over.

I do tend to have a VERY slow recovery, but the reality is that if you do become pregnant from this, the OHSS will get worse and you will likely find yourself in hospital. Make sure you rest, keep your fluids up and eat as well.

BW