Leg cramps, usually brought on by ingestion of alkaloids derived from or related the ergot fungus (which primarily feeds on rye). Such alkaloids include ergotamine, LSA (found in certain varieties of Morning Glory Seeds), LSD, and several others. It is a good sign you need to lay of the A for a while.
That Morning Glory trip was great, but I had ergotism for a few days. Better take a break for a few weeks.