I'm sorry to hear you are having such a hard time. I know from experience how heartbreaking it is.

I have endo too and it seems likely that was the cause of our problems. Have you considered another lap to remove any endo that has grown back or do you not have any other signs of that being necessary? The reason I ask is that we did 4 ET before my lap - all BFN - and then did our 5th transfer 2 months after my lap and that gave us DD.

Diet-wise, I agree that dairy is good to avoid when you have endo. Have you seen the endo diet? It's on the endo-resolved website. It's basically no dairy, no gluten, no red meat, no soy, no artificial anything and no refined sugar (and possibly others I've forgotten). It's very restrictive, but I know some ladies swear by it. I'm too lazy to do it properly, but I did cut out dairy and sugar before we started IVF#5 (5th fresh cycle) which gave us DD. I had also cut out dairy and sugar back in 2009 just before we had our chem pg (first ever BFP, naturally-conceived in between IVFs).

GL and I hope your 5th transfer is a success.

ps. Don't beat yourself up over positive thinking, or a lack thereof. I was certain our 5th transfer would fail since our embryo quality was below average. We had also had several other events happen during that IVF that had me on the verge of a nervous breakdown - there was no positive thinking going on at all that month and the IVF still worked.