Hello. Gosh, I'm sorry you are having this difficulty! There is no set rule but have heard of the subsequent episodes after the first being a bit more severe. I think it can happen but not for everyone. I'm sorry that it IS happening for you. It's terrific that you've had 10 years free from the beast of anxiety and panic. Once you get the health scare in order, then I'd go back to working on the anxiety/panic. What did you do the first time around? It worked (and for 10 years!)--- I'd repeat what you did to see if you can generate the same effect. good luck
There is no chronological based pattern because it is dependent on the many things that can cause panic for those susceptible. Have you identified anything causing it now and ever had therapy to deal with it before?