How to get migraine medication and how to know when to take it

I’ve been getting migraines my whole life and I’ve kind of known they were migraines my whole life (not sure how). When I was a kid, I’d take an acetaminophen (like Tylenol) and my migraine would go away. They were very infrequent. As I got older, acetaminophen stopped working and I switched to Ibuprofen (like Advil). Ibuprofen has worked for me pretty consistently up until a few months ago. My symptoms have been getting worse and new ones have been coming up. My sister also gets migraines, but she has prescriptions for zolmitriptan and Cambia. She has given me a few of each of those from her stash for me to try out. Zolmitriptan is like a magic migraine pill for me… seems to make the migraine completely go away within an hour without the migraine hangover. Unfortunately, I only have 2 pills left and it is nearly impossible to get an appointment with my doctor to get a prescription for myself. Other than a confirmation from my doctor a couple months ago that a recent MRI for something unrelated showed I have the brain of a person with migraines (which is pretty cool), I have never gotten nor asked for any support from a doctor for migraines. So, I don’t know how to talk to my doctor about it. Should I ask to see a neurologist too? In the meantime, how do I decide when to try ibuprofen vs take one of the few zolmitriptan I have left? I’m worried if I start consistently taking zolmitriptan, my body will get used to that too and I’ll need to take even more intense medication. I’d appreciate any advice!