Emma, sorry to hear things weren't successful for you. Regarding the eggs not fertilising, you could ask the doctor - assuming you didn't have ICSI that time - if the embryologist commented on sperm morphology (shape) not being optimum for fertilisation? my embryologist told me that the head of the sperm has to be the right shape to burrow in, and there's a few other things about the sperm also that they can check. If you don't have any objections to ICSI, maybe you could ask to try ICSI next time if you have less than 5 eggs collectecd (that's what my clinic does automatically unless you request not to). (ICSI is when they inject a sperm into egg).
They will probably also adjust your medication levels to try and produce more eggs for collection. In my experience they always seem to change the protocol slightly for each new attempt, that always made me feel better anyway, that they were trying somethign slightly different.