Hi BL and welcome back!
That is often exactly how my anxiety manifests itself. Upset stomach, with a heavy feeling in my head, like I must lie down. My body often feels foreign to me...and just 'off'...can't fully define it, but yes, your post rang many bells for me.
It is funny, as individual as we all are...we also have such similar anxiety symptoms!
It is especially hard having it come back after such a great reprieve...
...however the silver lining is that if you had it managed so well before, you can do so again. This is just a detour along the journey.
Practice your coping skills, and you'll be back on track soon.
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT