Feeling defeated

The heading says it all. I'm feeling very defeated today. I've been at this for 20 months with 2 miscarriages in the last year. Went to the doctor yesterday and I wish I could say I felt hope but I don't. I can't imagine doing this for another 20 months or experiencing another miscarriage. 2 of my friends are about to give birth. I would be too if I hadn't miscarried. That realization just left me in a ball of tears last night. It just really sucks. I guess I just need to hear something positive. Am I the only one? What do you do when you feel defeated and like giving up?