Distraction is a great first step. If I was sitting in bed having those thoughts I would just jump up and start getting ready for the day, maybe clean, read, put on some music that I love to sing with, read to my kids, plan the menu for the week, make a big breakfast etc... Of course these are what distract me you will find your own way. But pretty soon, after I have been doing something for awhile, I will notice "Hey, my heart isn't pounding out of my chest anymore and my dizzyness is gone." I only note the change for a moment because, in my case, if I dwell for too long on the fact that I feel better I start to have anxiety again (I am so weird).If I'm careful and play my cards right I am anxiety free for days.(okay, maybe sometimes it is just for hours but the point is that it is gone for a time and I am happy)
Anyway, I hope you find what works for you.
Peace, Nina5