Frustrated...

My husband and I are TTC #2. I have been off my birth control since Feb. 2014 and we haven't had any luck yet. About a month ago I found out that I have a cyst on my left ovary. Saw the GYN and she says everything looks normal, come back in 6 weeks for recheck which is in 2 weeks. The last several times we've had sex I just haven't felt anything. I know some women can't orgasm through vaginal penetration but I've never been one of those women. Every time my husband enters me I orgasm except the last 3 or 4 times. I am turned on and wet but as soon as he enters me it's like that's it and my body shuts off. This is seriously bothering me and I don't have any one to talk to. Any suggestions on what could be causing this? Any help on how to fix it or help the situation? I've cried the last 2 times because I just feel so helpless and like a failure.