If you are Ok now, I wouldn't worry too much. Migraine intensity/duration can vary greatly between attacks.
I'm very weather-sensitive, and I went through a period in Feb. when our weather here in Detroit was particularly bad where I had a week or so of migraines so severe, I was bed-ridden. I started to worry a bit, but as the bad stretches I've had in the past have done, this bad stretch too passed.
Look at it this way, if you have had a migraine-free day or two (or close to it) since the bad stretch, chances are it was just a bad migraine that ran its course. If it was a serious condition, you likely would not feel better. BTW, I've had migraines that lasted much longer than 3-4 days. I think 10 days is my record.
Again, you should address your concerns to your doctor, I'm just telling you my personal experience. Hope that helps!