Hi M1sspiggy, so sorry to hear you're feeling so rubbish. I've been there and still very much have ups and downs, depending on what's going on in my life and whether I think about it too much. I do try to bury things but it only makes it worse.
I also wondered if I'd made a huge mistake in having a baby as it was far more of a shock to the system than I was expecting, and don't speak to me about comfort eating... i'm the size of a whale due to my choccy addiction
Like you I felt that I couldn't talk to my dh as he had enough to worry about, and I didn't really want to take medication. In the end it got so bad that I ended up taking 2 months off work. If I'd faced up to it earlier then maybe it wouldn't have got so bad.
I really think that you should see your GP asap, I am taking antidepressants and have found them really helpful. Just talking to the GP helped so much, I really unburdened myself and felt better for it. When I told dh he was really supportive and no-one has ever judged against me because I've been taking medication. It's a well known fact now amongst friends and colleagues, at first I tried to hide it and then I thought, "Why should I, if it was any other illness then I wouldn't hide it".
You will feel normal and happy again, you just need a little help. My dd is now 18 months and an absolute joy to me.