I should mention that I do not have TOS so this is a bit of an outside perspective, but this is what I have observed in regard to migraine, muscular pain with referred headache, and triptans:

I often get migraines that come with muscle stiffness and neuralgia. (It took me a while to figure this out.) In these cases, massage seems to makes things worse. A triptan (such as Imitrex) not only treats these headaches but it also lessens my associated stiffness/neuralgia.

I sometimes get headaches with muscle soreness that are not migraines. In these cases, the triptan does not help but massage does. The primary causes of these headaches in my case seem to be tension or postural problems.

Now, it is possible you could have true migraines as well as TOS... but if, as you say, you find "lumpy tight spots" that cause the pain... it doesn't sound like a true migraine. In that case, I doubt a triptan would help. (And, fwiw, even if it were going to, it would take about that long to work. )

Well, basilar migraines come with a whole set of peculiar symptoms but if you you have any doubt whatsoever that you might be having these, I'd talk to a doctor about it. Definitely, you should not take Imitrex or other triptans unless this possibility is ruled out.

Best wishes to you!

waves