Hello Mr Watts,
So good that you have found this forum, too bad that you’re now part of the family. I live in the Netherlands too and there are a couple of things you can consider already. Get a prescription for verapamil as a preventive as long as you do not have O2. O2 is the safest and quickest abortive, but also get some Sumatriptan as an abortive if O2 is not working anymore or the attack is just too severe. If I were you I would change to another neurologist. Mine is Dr. Couturier of the Boerhaave Clinic in Amsterdam who is an expert in this field of CH in the Netherlands. He has helped me tremendously and will prescribe O2 immediately as well as the meds you are going to need.
All the best!