Oh sweetheart - have you married my ex?!
My ex turned nasty when we married - it was as though a switch had been pressed. He also becamse insanely jealous, and tried to separate my from my friends and family. I didn't understand why and I'm still not sure but you know what? It doesn't matter WHY these men do this, what matters is that he is treating you like this.
I think, with my ex, he was wanting to be in control. I'm certain he wasn't, at that point, having an affair (that came later). He said he liked strong women, but he couldn't cope with the idea of one once he'd married one! I spent so much time placating him and trying to soothe the atmosphere so that my daughter (his DSD) didn't pick up on the problems - this was futile, of course, she was only little but still she knew that things weren't right.
I'll warn you about what might happen next, in case your DH has got the same ideas as my ex. When my ex realised that he'd pushed too far and I wanted out, he suddenly switched back to the funny, fun, loving man that he'd been prior to the wedding. He was like that long enough to lure me back in - then the cycle started again. Over and over.
And if I was proving difficult to lure back in, he would threaten suicide. He went into detail about how he'd do this. I couldn't bear the idea that he might do that, not for his sake but because I didn't want my DD to think that was a way out of problems. So I put up with far too much, for far too long, before finally getting rid.
(I also think that was very dangerous - he seemed to think that it was "romantic" if a couple died together and I genuinely think that if I'd shown the slightest wavering over this, he would have been suggesting a "suicide pact". BE VERY WARY!)
It would have been much better for me and for my DD if I'd acted quickly, within that first year of marriage, and divorced him then.
I know it's so difficult. There are all the practical things to consider if you split up, plus it's not easy to admit that your marriage has gone south so soon. But this is, or should be, your honeymoon period. Some honeymoon, huh? It's probably more likely to get worse than to improve. Please take everyone's advice and cut your losses NOW.