I get cluster headaches. Been on 200mg of topiramate for years, also Gammacore off and on and oxygen. I had a really bad cluster in 2019 which essentially ended my career.
I would push for Gammacore if you think you are in the middle of a cluster. It can “push”you out of one if you know what I mean. I am really lucky in that my neurologist is a specialist in them. I had to be taken off verapamil because my hr went to 20. Sumatriptan tablets didn’t work and I couldn’t inject whilst at school.
In terms of triggers, weather changes, pressure changes (going on a plane last year was horrific and set me off again), stress, alcohol, light outside (so the seasons).
I started having clusters over 22 years ago, the knowledge base now is so much better. Good luck

.
Just as an aside , Cluster headaches don’t react in the same way to other migraine medication. That’s why Gammacore and oxygen is often used. Most general practitioners don’t understand this and also don’t understand that when you wake at 2am every night with no pain, but knowing that the reason you’ve woken is because the pain is coming is terrifying. They tell you to sit in a dark room but sitting doesn’t help. The pain is too bad. Unless you know someone or speak with a specialist, you feel so alone.