Having a seizure. It started about 3 hours ago and it's starting to subside now.
Peter, what ever else you are doing, drop it and get to a doctor. Carry all the meds you have taken in the past three or four weeks.
Do not take a chance with this.
Don't worry, I've been having them on almost a daily basis for the past 7 years, although I didn't know what they were until recently, and this is just a normal part of my day for me. I got out of hospital yesterday after a 48 hour video-EEG telemetry sleep study, which was to investigate why I get so tired so often, and it turned out that my hitherto unidentified episodes of tiredness and other strange symptoms were actually seizures. I'll get a report from the neurologist in a couple of weeks once the results of the study have been analysed in detail, and I'll be able to pursue treatment options when I see my psychiatrist in 3 weeks.
You can read more about it
here.