Depression.

I have a history of depression, really bad during pregnancy. I've always been able to talk myself through it, but recently I can't seem to shake it off. I'm almost 20 weeks, and I still hit the gym regularly, I try my best to pray, and and spend time in meditation... but I feel like I'm sinking, and I really don't know how to stop it. The things that normally work, aren't working anymore, and although surrounded by tons of loving folk, I still feel so alone. Not sure what else to do at this point. I'm really trying to be happy here.