Boss Makes My Stomach Churn

I am leading up to a meeting with my boss – the request to meet was completely benign but I instantly had a physical response and my brain is now churning about what the meeting could be about. I tried to do a model but I keep coming back to fear – I can’t seem to convince myself that this meeting is benign (I have no knowledge of anything negative that this meeting could be about) I am certain that my interactions with him are limited by how I show up to meetings with him as is my professional growth in my organization – help