I had a similar issue after an intense biceps day (I had added 10lbs to my sets w preacher curls). I couldn't straighten my arms without bad pain for 3 days. It caused pain in my lower biceps and upper forearm around the crease opposite my elbow.
This had happened 1 time previously and in my case I think I overworked my arms and didn't stretch properly afterwards. Also, in both cases I hadn't been drinking my usual 2 gallons of water per day.
So, my recommendation would be to give your arms a break for a few days and stay hydrated. Stretch the arms out periodically throughout the day. My arms seemed to hurt worse the longer I went without straightening them. It was the worst case of DOMS I had ever experienced. I hope this is all that is going on with you and not something more serious! Keep us posted and Iwish you a speedy recovery!