Not Enough Imitrex?

O.K., so I've started having this fear of not having enough Imitrex. Supposedly you are not able to fill your Rx unless it has been a month. Isn't that great. So, I've started playing the waiting game. Do I take one or not? I currently have 1-2 left and am not sure whether or not to take one. I had to take one last night, but am now starting to feel one coming on. This is such an annoyance because according to the doctor, you're suppose to take one as soon as you feel it coming on. I used to be able to take a high dose of Advil, but that doesn't really work anymore.
I also start the game of 'what caused one to start,' as soon as I feel it. My husband tells me not to do that, but it is if I can't help it. I don't know if it comes from trying to figure out the triggers or not. But, I spend time reeling over whether or not I could of done something better or it figure out what not to do tomorrow. This does get kind of ridiculous because just the slightest thing could go wrong and trigger one. Maybe I ate lunch an hour later than usual or I did one too may activities that day. Who knows! The weather is really driving me crazy. We usual have a month, month and a half of daily thunderstorms here in Denver. This year, it has been all of May, all of June and so far most of July!
Anyway, for the sake of my children and since their father is out of town, I'm going to take something. I think I'll try an Advil first. I'm glad he is only gone for five days. I always fear getting really sick when he is gone. At least I know I can call our friends if I need help.