How long do after effects from migraine stay for? Head pressure slight headache

Depends. depends on how severe your migraine was and how took the abortive medication, the faster you abort the migraine before it escalates into a full blown 10/10 migraine the faster your brain will return to it's normal baseline. I advise my patients to not wait for an hr and treat even a mild headache at the very onset (so long as not treating migraines more than 2 times per week)