I think you're getting good advice here. I also think you need to turn the discussion with your DH around so rather than being unhappy and miserable, tell him firmly that you want to discuss together how, as a couple, you can solve the problem. It does sound like he is somewhat unsympathetic, but, giving him the benefit of the doubt, perhaps if he seems you want to find a solution that works for everyone, he will be more supportive.
To that end, you need to find a job that is set hours and/or a short commute. I don't know what you did before, but I think a lot of office and retail type work can be very set hours and would allow you to manage appropriate childcare. Also, if you use a childminder, you may be able to find one that either starts a bit earlier or finishes a bit later, allowing you more flexibility in finding a job.
Also, and this one is contentious, I think that men need to start stepping up. I worked in the city, at a relatively senior level and DH was a SAHD when I went back to work. However, I was absolutely religious about leaving "early" at 6pm on the day DH had his hobby. And surprisingly, people took it quite well. They saw I was there the rest of the time. And also, in a genuine crisis situation, DH accepted that he'd have to skip that week. There was a man who sat opposite me whose arrangement with his wife was that twice a week he did the school run. It meant he got in "late" at 9:10 on those days, but as he had his blackberry and planned around it, I am not sure anyone even noticed. And this was in a very high pressured, stressful and unfamily-friendly environment.