I have migraines relatively often - less often now that I supplement with magnesium, and more often when I'm a moron and eat wheat/sugar even though I know it causes me pain.
The thought is that you should see a doctor anytime you either start getting migraines or there is a change in how your migraines present. So, for instance, if you always get them on the right side and it flips to the left, or you didn't have auras and now you do. Personally, if I were you, I would see a doctor.
It's possible you have triggers that you either didn't have before or to foods you weren't eating much of before. Wine is a huge trigger for me (3-day migraine within about 20 minutes of contact - even foods that were cooked with it or marinated in it). Others are chocolate (especially dark chocolate - I think because it's so concentrated), sodium nitrite (preserved meats and commercially dried fruit) as well as drops in barometric pressure, spikes in blood pressure and lack of sleep.
It might help to try to avoid chocolate and processed meats, including those with celery salt/seed/juice since they tend to actually have more, along with wine (red and white). They tend to be the most common triggers, though some do react to certain types of cheese as well. If you want to try adding them back in later, by all means, but I would cut them out until you figure out what's going on.
And yes, I would see a doctor.