If his temperature, poop and urine are normal, then perhaps it's not a feeding issue. 90-120ml every 2-3 hours is normal in terms of intake; that's how much my first child drank, too, at that age. You say he wants to be carried and he keeps chewing his hands - so maybe he just wants to feel secure. Have you tried giving him a pacifier? You can also just hold him, let him smell his mum's scent and feel her warmth.
I think is teething. Painful and itchy gums which is irritating him. Take a hanky, dip in ice water, squeeze dry, wrap e hanky around one finger of yours, put tat wrapped finger into his mouth and gently press on all parts of his gums. Observe his reactions. Tiz is soothing for ur baby. He should calm down/appears to be better.
For all unexplainable behaviour, I just take it as a development phase. I read somewhere that when babies are learning a new skill, they get highly irritable coz it's like they have a voice in their head that can't switch off.
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it could be the start of teething. some babies star as early as 4 months and some start as late as 10months. my boy is a late bloomer.
It could be teething or it could be a growth spurt too.
Most probably teething. He has just began the stage.