I would see how he is over the weekend and then phone Monday if he was still the same, I remember when ds was non verbal / not communicative, you literally have to go through everything like they are a baby don’t you. Ds is often out of sorts and I never find out why, it’s so frustrating. I hope he’s ok 
Ds is better at explaining obvious illnesses, tummy ache / head ache now but often it’s still a guessing game.
He told me this afternoon he had tummy ache (he looked like he was sweating) so I gave him some neurofen and put a a nappy on him to have a Pooh (he gets tummy ache if he needs to go and will only go in a nappy) he said I’ve got tummy ache because xxxxx (same child who keeps hitting him) hit me in my tummy today and knocked me over onto the floor!
I don’t think it’s related to that, as methylphenidate can give them a tummy ache and he had one last week too although that could be a coincidence, but he’s joined the dots his tummy hurts and so and so hit him there.
Not happy about what he told me though! But then ds told me last week she hit him that day and then his teacher was like no they are separated at all times so I think ds is exaggerating a bit or getting confused as in she hit him but not necessarily the day he’s said it was.
He was very specific about her hitting him in the stomach though
same as when he was specific about her throwing a drum at him!