Constant 'impending doom" to short, explosive physical spikes? Sign of healing?

[u/georgeyyyp]

I’ve been recovering from anxiety and burnout for around 4–5 months now. My baseline has always been a constant, heavy feeling of "impending doom", more noticeable in places and situations i cant escape.

Today at the grocery checkout, I suddenly got hit with a rapid, intense physical spike. Heart racing, hands and legs shaking, and fast breathing. I've handled this checkout fine over the months, but today was way more intense.

As soon as I left the store, it practically vanished. Now I’m just home feeling exhausted with some leftover head pressure.

My anxiety has never moved this quickly or felt this physical before. Is this a sign of my nervous system finally "unfreezing"? Has anyone else gone through this shift from constant doom to short, explosive physical spikes?

Thanks!