Have you got any support lovely? It's tough being the one caring for someone with depression... My husband and I have been to hell and back with it, but the most important piece of advice I can give anyone is to keep talking - you and him. You need support too. Going through a miscarriage needs to be talked about and you are more than allowed to feel the grief and work through that bit by bit.
I'm glad he's going to go to the drs. Will you be able to go with him? Definitely don't be put off AD's because one or two don't suit and remember that any negative side effects should stop within 2 weeks - but as Paula has said they take a little longer to get into your system...