I don't think you are too old at 37 to try again - it's a question more of whether your doctor thinks it's safe (given that you nearly died after your first MC) for you to keep trying, and whether you think that you can cope with the fear of another MC.
My first two pregnancies ended in early MCs, and then I had DS1. We then tried for another baby (because I'd always wanted at least two), but I took the view that if I had another MC, or I never got pregnant again, I would cope, because at least I had DS1 - and I never expected to have him. In the end I fell pregnant with DS2 at the first attempt, and had the most uncomplicated pregnancy.
But although I would love another baby (another two really), I don't feel brave enough to try. I'm almost 40, and I take the view that if we have a happy accident between now and the menopause, and it works out well, then it was meant to be, but I daren't actively try to get pregnant. Strangely, I feel less philosophical about the possibility of a third MC than I did when we tried for DS2.
I suppose what I'm trying to say is that two MC don't mean that you won't have a successful pregnancy next time round - all it does mean is that you will be more stressed and may find it even harder to cope with a third MC.
What does your DH/DP feel about it?