No nursing, no sleeping

Where did my sweet cuddly newborn who slept through the night at 6 weeks go? Ethan has been through alot lately with his Daddy being in the hospital, teeth popping through, a fever of 101.9 for a day, and Mommy gone from the house twice a week for 13 hours. He refuses to sleep through the night. I try to rock him back to sleep but an hour later he is screaming in his crib. Eventually, I just take him back to bed where he snuggles in and tries to nurse all night long. However, he's not really nursing, he is just soothing himself by sucking. Then during the day he refuses to nurse. It might be that he is just too busy, but I'm not sure. He nurses for 30 seconds and tries to situp and cries. I'm wondering if I'm going to get my period soon and my hormones are changing my milk. Whatever is going on I hope it ends soon. I enjoy nursing Ethan and I'm not ready to wean him. Plus he is supposed to nurse for at least one year. I still have 4 months to go! It seems that whatever I do lately results in him screaming at me. Change his diaper -- scream. Play with him -- scream. Feed him -- scream. Exhausted doesn't even begin to describe how I feel. I just wish I knew what to do for the little guy.