I had moderate OHSS first cycle >20,000, mild second cycle >14,000 - both with no BFP.
Did very well third cycle with no OHSS symptoms <10,000 woo hoo so they gave me the final luteal support HCG injection. Then I immediately got mild OHSS but not as bad as 2nd cycle. All symptoms went away about 3 days after day 5 transfer so held no hope. But then 6 days after transfer I now have mild to moderate OHSS symptoms again. The pain and swelling ouch. Currently 9 days after transfer and 14 days after EPU and 12 days after final HCG shot.

I didn't have vomiting or diarrohea, rather constipation, bloating, aching, cramps in the ovaries and hips, intolerance of my normal clothes and sharp pains from my ovaries extending to my ribs. I can't move fast or stretch out or bend down. minimal weight gain though and the bloody headaches and inability to eat more than a small meal.

good luck with yours. I so hope for you. My symptoms at the moment are about 3 times worse than just after EPU, but not anywhere as bad as my first cycle. My FS did say to expect a large increase in symptoms if pregnancy occurred, but I didn't expect all symptoms to disappear then reemerge with a vengeance.

I'm very regular and AF is due today according to last 5 transfers (2 fet), but have no symptoms of AF this time. Just did a HPT and got a strong positive, but not getting my hopes up as it's the first time I've had that HCG support shot, and I have read and read it takes about 10 or so days to leave the system. Fingers crossed heaps but feeling much calmer this cycle.

Again good luck. From what I've read if you become pregnant the symptoms slowly get worse until around 4-6 weeks after EPU and then start easing off. But then again every person is different. Make sure you weigh yourself morning and night as in severe cases you can put on 2 or more kilos in a day, by this time though you won't be walking (I put on 2 kilos in one day and couldn't get up or walk when I had moderate OHSS and I didn't even need hospitalisation then!). Sorry I don't give you much hope of the symptoms disappearing overnight but it does apparantly get better eventually.