Sounds like you're having a rough time of it.
Studying abroad is really exciting, though, and if it's for an area of study that you love and will help in your future, your husband will likely be supportive; he sounds like a supportive, wonderful husband.
I lived away from my fiance for 5 months when I studied abroad in Spain, and it was terrible and wonderful in many ways. I learned how to communicate more with my guy and how to share my life with him when he wasn't living it with me. It was really hard experiencing such wonderful things without him, and not having him there when I was having a bad day. But it's doable if you have a strong, supportive partner, which is sounds like you do.
Breathe. It'll be okay. Sometimes making sacrifices-- like living away from your husband for a while-- can strengthen your relationship in ways you wouldn't expect.