I hate having migraines.
Common symptoms are early signals for instance dizziness, diarrhoea and nausea or vomiting.
After those early symptoms go away, the second phase of symptoms follows cold sensation, pain on one side (may swap sides), thumping or throbbing headache,loss of concentration or inability to think clearly or perform normal activities. It's not the case that all symptoms have to be present.
A whole host of triggers can cause a migraine in people who get migraines. For example...