Like KOM, this sounds to me like it's a function of poor sleep and/or over-stimulation. For me, everything is worse following these occurrences and the only time I get dizzy/disoriented now happens following intense activity engagement.

The journal is a good idea as it may help you track this. I map my headaches and other symptoms using a headache calendar, and layer my activities over this. For my treating doctors they could then easily understand how activity impacts my day-to-day well being.