So sorry that you are not getting any good news from your FS.

To me a zero fertilisation rate could be a number of things. It could be that there is a sperm issue that isn't turning up on the semen analysis (which only looks at the "look" of the sperm), it could be that your eggs aren't as mature as they think they are, or it could possibly be a genetic issue of some sort.

DH and I both had a DNA profile done (I think it cost about $700) which given what cycles now cost may be worth it. Or ICSI could be wourth a go, but if the sperm appear normal then I'm not sure how this would help (it is usually used when there are low sperm numbers or where the sperm doesn't have the energy to break the shell of the egg)

There is also something about some women carrying antibodies to sperm - but I'm sorry - I don't know much about it at all.

Good luck.