Depression during pregnancy

Okay, so this is very hard for me. But I am 27 almost 28 weeks pregnant and am finally accepting that I may have pregnancy depression and it's not just the hormones. I'm tired all of the time, I'm irritable, have horrible anxiety, I never want to do anything. I get frequent migraines. I have aches and pains all the time..I never want to have sex anymore, I go into these ridiculous moods where I just get angry out of no where and feel like no one cares about me even though I have tons of love an support. It's so hard on my DH because he doesn't understand that it's not him and I'm just extremely emotional, I have crying outbursts. I feel guilty for not being happy because I wanted this so bad and tried for months to get pregnant. I'm also hypothyroid which I've read can contribute but my levels are controlled. I also quit smoking cold turkey the day I found out I was pregnant, maybe that is a contributor? I've felt like this since about 7 weeks. And sometimes it gets better for a while..a week or so, and then comes back full force. Has anyone else experienced this? I don't know what I should do. I would not take antidepressants while pregnant as I won't take any medicines besides Tylenol so I don't really know what I can do exactly. Help?