Brother having Migraine Attacks frequent

Hi, my brother is having frequent migraine attacks since last 1 week or so. We took him to doctor and hr prescribed Headset medicine to take when needed. The medicine gives him relief and he goes by the day but next day migraine returns. Now we don't want to give him this or any medicine for long term as he may get used to it. He has had a history of migraine but not experienced any since last 2 years. May be he is working from home and not getting to go outside. Also he is a regular drinker and smoker. We had MRI done 2 years ago but found nothing. So not sure the cause of his sudden migraine return. We dont have option to take him to doctor frequently due to Coronavirus lockdown. Can you please help provide any help to manage his migraine.