Acid reflux symptom or seizure?

Ebony

Has anyone experienced their baby getting kinda stiff when lying on their back and seeming like they want to cry but can't and then they either spit up or drool when you pick them up and they can suddenly are able to start crying loud. I am so worried that this is a seizure but I've also been reading it can be a symptom that baby has acid reflux.

Any other moms experience this??