Big hugs for you
I too have a husband who blows hot and cold and changes his mind every week, so I know how hard it is.
We nearly got divorced 2 years ago and while separated I started treatment proceedings as a single person. I was going to go ahead without his consent if I could not get the divorce through quick enough due to my age. He did change his mind in the end and wanted to have treatment with me. So I back tracked and he consented and said he would support me.
We had a cycle in 2009 and got pregnant - but then lost it at 16 weeks. He took it badly although he would never admit it, as he does not want to admit he was starting to accept a donor baby. Then this year I have tried again and am pregnant again and he is being really off and cold. I had to beg him to sign the consent and he is now saying he might be at work or in Glastonbury when I give birth!
I am starting to regret going back with him now!
The things I found out from a personal meeting with Natalie Gamble (she saw people at my clinic) is that the good news is that you are in control of any created embryos as it is your eggs and the donor's sperm. It is not DH's gametes so your husband has no say in whether they are destroyed or not.
The way I see it is that you have a few options to consider. You could either abandon this cycle and sort out the relationship one way or another, go ahead with the treatment and create the embryos and have them frozen for later use on your own (need to check this is possible - but it is yours and donor's gametes and I think your DH's part of the consent applies to replacement in the uterus - because that is when a cycle could result in a pregnancy that he is legally responsible for - I could be wrong), or keep going and see if he comes around.
It is a bit of a mess though and a difficult one for you both.
Men do my head in! What is wrong with them? Maybe I should say some of them?
Suitcase - you have the right idea - doing it alone without their complications and spanners in the works!