I may be vengeful here, but if all of Naive's transportation ideas don't bear fruit, i'd take your husband up on his offer and contact his direct superior. Explain your situation and tell him that your husband was the one who suggested him as backup transportation should your hubby be too blotto to take you to the hospital.
I'm sorry if it sounds harsh, but your husband isn't leaving you much choice.
I also think you should discuss your situation *honestly* with your doc; perhaps there are social services that you can avail yourself of and that you aren't aware of at the moment.
jennander1, if you find ways not to depend on your husband, then it'll help ease your stress regarding the upcoming birth.
As for the sober husband vs. the drunk husband, you simply cannot dissociate the two. They are one man. Do you love and accept him as who he is today, right now? ...That's the only person he's willing to be.
I hope you keep coming back as much as you can and keep posting!