Hello, Jack! Great to see you here - you will find a lot of support for you in this forum, really great people.
I found a couple of things to be very helpful during those vertigo moments. Top of the list is a mindfulness exercise. It could be as simple as asking yourself, 'Am I breathing?' Then focus on the sensation of breath. Cool air comes in. The chest expands, the diaphragm drops. Clothes move against skin. Warm air goes out. Just become aware of these sensations.
Then you can become 'the watcher', a nearby observer of you. You get to see things happen, but with a slight separation between you and the feelings that you are experiencing. The feelings are not you, because you are The Watcher who observes these feelings.
You only need a second or two to recall the Big Plan, and then the separation between you and IT becomes clear and tangible again.
Like Soberlicious says, you got this! Onward!