Pink, these fertility visits can really make you feel like you've been hit by a ton of bricks. Try not to feel frustrated or lose hope. I was pretty much unexplained before going into IVF. Basically none of the IUIs worked and my ovarian reserve was low (not drastically low, but low enough) that IVF was the next logical step. Our doctor had a lot of theories, maybe the sperm and egg weren't meeting, maybe there was an egg quality issue, or a number of other things. So we felt in the unexplained category, too. However, I wanted to do IVF because whether it worked or not it would explain and reveal a lot more about our fertility than any of the other tests and scans were showing. They would be able to watch real sperm/egg interaction and study my eggs and finally tell us what the heck was going on!
Based on the doctor's recommendation, we left half our eggs to fertilize naturally and half the eggs were ICSI (just in case the sperm and egg were not meeting ICSI would do it manually). Well, all the ICSI eggs crumbled apart except for 1 which fertilized, and then 2 IVF eggs left to do their own thing fertilized. The ICSI egg died, one of the IVF eggs was really poor quality and 1 was good quality and transferred. I had 15 eggs retrieved in total and during the transfer my doctor said the embryologists noted some egg quality issues which explained why we hadn't had any success and why the ICSI didn't work.
Also, the biggest lightbulb thing he said which I have said on this board before, but will say it again is that those 15 retrieved eggs represented 15 months of ovulation and only 1 egg was strong enough to turn into a good quality embryo.
Anyway, I think you are in great hands at Hammam. They are one of the top two fertility clinics in Toronto and I have only ever heard good things and read great reviews on them. It stinks that you will have to do the HSG and repeat some tests, but they aren't leaving anything up to chance.
Also, taking a vacation before IVF is probably the best thing you can do. I'm repeating myself here again, but we took a fantastic vacation to Hawaii between the failed IUIs and IVF and it was so healing and relaxing. I felt completely calm and rejuvenated going into IVF, I was just ready for it after having such an amazing time away with OH. I can't prove that our vacation helped IVF worked, but it really helped me find inner peace and I was such a wreck emotionally up until that point.