3 failed IVF cycles

My husband and I got a called this morning informing us that our third attempt failed. Our first attempt was a stimulated IVF. We had 8 follicles and out of the 2 eggs retrieved, one was malformed and the other was not matured. Considering I have severe endometriosis, an endometrioma on the left ovary, low egg counts from a past surgery and my husband has low sperm count, our doctor advised us to opt for a natural IVF cycle. We went through one beginning January after taking for 8 weeks DHEA and COQ10 supplements, they retrieved a mature egg but it did not fertilized after the ICSI. This time, they retrieved again a mature egg and after fertilization, they called us to say the embryo did not develop as it should of had (3 cells in 24 hrs instead of 2). I am devastated. I try to remain positive but I feel this is never going to happen for us. We have one more try, where they will stop my cycle with injections for 2 months and then do an artificial stimulation. Has this ever work for anyone? I don’t want to let go of the dream to be a mom, but I will not be able to go through another fail.