Having a migraine is a terrible experience.
Common symptoms are first signals like numbness, diarrhoea and flashing lights.
After those early symptoms go away, the next lot of symptoms arrive inability to think clearly or perform normal activities, loss of concentration, pain on one side (may swap sides),pins and needles or temporary numbness on the affected side. It's not the case that all symptoms have to be present.
A whole host of triggers can induce a migraine in migraine sufferers. For instance......