Postpartum and intimacy

This is embarrassing to talk about but I am need of help in this department. I am losing myself each day and it's been also affecting my marriage. Ever since I had our son (he's 5 months), I haven't felt any desire to have sex.. And whenever we do, I don't even get "turned on" like I used to.. Sometimes not even ANY percentage of adrenaline. It's terrible!... And I have to admit, the only time I would feel turned on is if I see a sex scene in a movie, but rather than feel the desire to be that way with my husband, I'd rather do it to myself. I'm going to try and make this short, but basically I've also been having major mood swings... And according to him, I've never been this bad before.. I mean we've had huge problems and constant fights way before we got married, and we got so much better about 6 months before I got pregnant.. And we were also pretty great during the pregnancy... But then after I had our son, that's when I just haven't been the same AT ALL. Am I the only one through this? We also recently bought our first house too, then the husband got a new job which he has been adjusting to working graveyard, etc. My friends say it's bc I'm a new mom, we had all these new big things happen for us all at the same time etc.. But I started thinking I suddenly wasn't in love with my husband anymore and wanted a divorce. My husband has been trying to be patient with me and figure out what's wrong.. But I do pull away.. And when I swung the divorce thing, he just lost it. Please help. I have talked to a Dr by phone and will be following up again in person. I don't know why this is happening to me nor do I know what to do. It's affecting me and my marriage very suddenly and our relationship is deteriorating right before our eyes. Honestly when I looked up my symptoms because I realized it a week ago.. I think I may have a bipolar disorder and the on call Dr said it may be too but that's why he scheduled an appt with my primary Dr next month. Please help. I feel so broken.

Thank you.