rhubarb - there are really two issues here, i think. The first is that you are getting no support at a time when you really need to be able to try to think positive and mentally prepare yourself, and the second is that your partner is not behaving in the manner you expect him to.
Can I just say about your partner - if he is not comfortable to be involved in the birth, might it not just be better to do it without him? There is a lot of pressure from society nowadays which says that men and women should want to do this together, which I don't think is fair on either party. A partner is often NOT the best person to support a woman in labour anyway - they have all sorts of baggage of their own which can often intrude and be unhelpful (like the fact they hate being powerless and unable to "sort out" the fact that the woman they love is in pain". That said, some men ARE great. You need to try to sit down and talk to him about this - does he want to be involved or doesn't he? If you can bear it, can you allow him to make his own decision on this, and not pressure him into saying he wants to be with you, while really he will be resenting it? It might be worth telling him what you would expect of him if he was there as a supportive partner, so that he can decide how involved he wants to be.
Of course, if he IS unwilling to be supportive, then you do need to find someone who will be. A doula can be a great help - and if he is unwilling to be there for you, and between you you decide that he needn't be, then at that point hopefully he will no longer feel that a doula would be a problem for him. Or do you have any close friends, family who might come and support you? This is often much better.
As for being obsessive - so what? It is natural to become quite focused on this sort of thing (I get the same accusations from my dh) and if it helps you it is not a problem. I think the problem is that almost all men ARE a lot less interested than we are - they are not going to have to do it, and to them it is not something that is in the process of happening now, it is something that won't happen for another x months, so why bother now? I don't know if I am the right person to help here, because I have a husband who is almost completely uninterested in pregnancy and birth (and who didn't even come to the scan/antenatal classes first time round, let alone second time(although I have done neither myself this time either)) and I am just accepting that that is the way he wants to be. I know he will be there when the baby is here - the anticipation is just completely lost on him, and he will be as much use as a pork sausage at a bar mitzvah during the actual labour and birth. So I don't bother with him, except to keep him informed as a courtesy. HOWEVER, I do have wonderful support from a couple of lovely independant midwives (one of whom was my Year Tutor at university!) which makes it a lot easier for me. So you do need someone, and you need to be able to make him understand this - that if it is not going to be him it will have to be someone.
Have I actually said anything helpful at all, or have I just waffled aimlessly for a long time? I suspect the later.... I do hope you can talk to him about it, it is something you need to get sorted out.