Are you taking any type of medications? Some can cause very vivid dreams or sleepwalking, esp. if one has a CNS disorder of any kind.
It sounds to me like you had a nightmare. I have had something similar (though not frequent thank goodness) where I was crying in the dream and then woke to find I actually was crying. Had you actually had a seizure while sleeping, you wouldn't remember it or be able to describe the image of laying in the floor in a ball. Those suffering from true seizures may feel an aura beforehand, but do not recall the seizure itself. It may be that, with your sinuses acting up, you were running a fever while sleeping and that induced the vivid dream.
I am glad it wasn't real and that you are better today.
Take care.
I just recently had a sleep study and was prescribed the cpap machine. It's working, I can't remember the last time that slept as much. The only problem is getting used to having that mask over my nose and mouth. I wake up in the middle of the night with the mask in my hand. I received a telephone call from the person that brought the machine out to me and informed her of this and she told me that it was okay, a lot of people do that. I believe that you should get a sleep study done to determine what the problem is asap. Good luck to you