I have the same thing, that is how I get panic. I don't get one attack that subsides to nothing or into mild anxiety, I get waves and waves of panic. In between the waves I feel okay but the fear of the next wave (or an intrusive thought or something external) brings on another wave. It sucks and it's even worse when you think it's done and then you're hit with another wave.
It does stop though, I promise. No one can be stuck in a panic for ever, it's impossible, your body will burn up all the adrenaline it has and they will stop. Everything will be okay, just know that no you will not be stuck like this forever, you will get better. It just takes time and work. Keep going to therapy, keep up exercising, proper diet and staying hydrated. If you choose to medicate stick to the plan set out by your doctor, just keep working at it and it will go away.
One thing that helps me when I get stuck in the waves of panic and anxiety is just going on with life, pretending it's nothing. I just accept that this is my life now, and if the rest of my life is stuck in panic then so be it. Panic can't hurt or kill you so just let it tag along while you go about life. If panic wants to come hang out at the mall then let it. If it wants to visit at work just let it. Accept it and don't fight it, just say 'hi' and keep going about your day.
The best way to deal with panic and anxiety is to do fun stuff, hang out with friends and loved ones, go for a run, take up a hobby and let the panic and anxiety join you if they want. They will come or they won't, it's okay though because they can't hurt you.
Eventually you will find that they stop trying to hang out so much, when you show that you're not scared of them, that you're not going to do what they want, that you will let them come along in life but not control life, they will stop trying. Things will get better, just keep moving forward.
Hope this helps, it works for me.