weirdness

I had a strange episode today,  had been up for a coupe of hours, and had showered and tidied up and was just sitting down to watch tv when I noticed I had some vision changes. It started out just like I had looked at a light and that in my vision field and then it changed to a 'c' shape and it was prismatic and sparkly, it seemed to be moving from right to left and finally moved completely to the left and sort of faded to a cloudy spot in my up left field of vision. Then it went away and left me with a headache. Is this some new symptom or just a fluke or a side effect from the meds. Another question for the docs.