Hello Maggie,
Sorry to hear that you have medical issues to deal with, I am also sorry that you are having a rough time of it as of late. I thought I would answer your question in case it might help.
Yes I have had periods where I felt great for very long periods of time and then my anxiety/panic came back full tilt. I have been dealing with my generalized anxiety disorder and panic attack disorder with agoraphobia for many years.
The beauty of it is. I have had long periods of time where my life was really great; I had no meds and barely thought of my anxiety at all. And I am talking of periods of many years! But then something happens, an overload of stress in my life and this thing comes back to bite me in the ***. I used to get really angry and discouraged at this. But I find that since I have accepted that I suffer from this and might have to deal with it on and off during my life time I don't feel so angry or anxious about it. Ok acceptance of this and myself is an ongoing process at the moment really lol. One of the lessons I am learning but I find the more I accept it and myself with it the more at peace I feel and the more I feel up to dealing with it. Resistance causes much stress.
But anyway, yeah, I have the experience of feeling great then relapsing. I had had a 5 year long run that was great with no meds before December. But if there is only one thing I can say that is reassuring is that it gets easier, easier to get back up after a stumble. I find that this time around I am integrating things more easily, applying them to my life more easily, and getting better faster. See, as you learn to deal with this, you learn tools and techniques and they stay with you so that the next time you need them they are available. So it does get easier and hey, if you have forgotten some of your tools you can just come back on here and redo the program :)
Anyway, I wish I could tell you this will go away and will never come back for you and hey, it could, crazier things have happened, I know somebody who had panic disorder and hasn't has a panic attack for 15 years! But if it doesn't just go away, I can assure you, it get easier and you can have a good quality of life and lead a good happy life with this. That is what I am learning this time aro