I'm sorry if this isn't allowed, I know this is a picture place primarily but, I have a question

So, last night, my neutered, 5 year old boy cat just started howling and acting weird. I have 0 idea why. Other than, maybe he saw/smelled another cat last night that set him off? Idk. Has anyone else had this kind of a problem? Should I take him to a vet? He doesn’t seem to have a problem with me touching him anywhere but...