What is wrong with my baby?

So here's his symptoms he's spitting up and sleeping alottt like last night he slept 9-9 had a bottle went back to sleep for 12 (today daytime)then stayed up went back to sleep at half 1 had an hour an a half and he wasn't fussy to go to sleep I literally just gave him his dummy and he fell asleep

Yesterday I had him at the doctor's for constipation and for also bumping his head on a shelf doctor inspected said she couldn't see anything wrong with his head

But now I'm concerned he's either getting chicken pox as that's being going around or he's got a concussion?? What do you guys think? Btw he's started pooing again thanks to medication

He's about to be 8 months