I guess I'll give it a few more days and see if it passes.
I find if I think carefully about what I'm typing or writing and do it slowly I don't seem to have a problem, so far this post has been OK where usually there'd be at least 10 mistakes.
I'm not currently taking vitamins of any sort but I am on medication, don't think this is relevant though as I've been on it for, what, two years or so.
If it doesn't pass soon I'll look into Ginko Buloba, thanks.
Note: by typing very slowly I managed to only make one mistake here, which was bene instead of been.