I cannot function without caffeine. I've tried. When I quit caffeine I just drag my feet for weeks. But I don't do well with caffeinated beverages which lead to migraines. So...
I take 1/2 of a caffeine tablet with a tizanidine pill. It works great! I had daily headaches before and this combo fixed it. I take it 2-3 times a day and I can function well.
btw, typical NO-Doz tablets are 200 mg. A strong cup of coffee is about 85 mg. That's why I break them in half. Cheap ones are available on-line. Also, the long tablets are easier to break in half than the round ones.

I have had some positive experiences with Excedrin headache. This is caffeine and acetaminophen. They also make Excedrin migraine which is aspirin and caffeine, but I’m allergic to aspirin. Sometimes I use it as a preventative if I’m starting to feel woozy or have other pre-migraine symptoms during the afternoon.
I have nothing negative to report about using it, but like everything else, sometimes it works better than other times.
I like to keep it in my arsenal of rescue medications.

I have lots to learn!

Since covid it's hard to find migraine over the counter meds such as tylenol or excedrin. Only one I can find are drugstore brands. They work just as well. I use as a last resort.

It does helps during the morning.. I can't drink coffee but the caffeine tablets do help. Getting the arteries open up in my head. It usually 200mg which is about a cup of coffee. It effects everyone different. I tried chocolate to get the caffeine but it is painful to no end. I hope this helps