Welcome to the site Lilly.
Perfect first post.
I would look at your oxygen setup first. what size are the 2 tanks that you have and how fast does your regulator let out the o2? You will want to get as much oxygen into your system as fast as you can at the first feeling of a cluster coming on. This sometimes needs up to 25lpm regulator and a larger rebreather o2 mask. The symptoms you feel with stuffy/runny nose swolen eye, I tand to get them all too just not all at the same time and not the same thing every attack. One attack i might have a stuffy nose and get the feeling I am over heating the next one I might have a tearing eye and be cold.
Sumatriptan injections work great in aborting your clusters but some believe the more you use them the more attacks you can get and they can make you feel groggy after you take them this is why the oxygen setup is so important. If you optimize your 02 setup you will cut down on the injections and feel much better.
The Verapamil will take some time to make a difference and people usually take a larger dose up to 720mg a day of this but only your doctor can up that for you.
Look around on this site and ask a tun of questions and you will find a lot of help here.