Jekyll begins to worry that Hyde has taken over his body as he is addicted to taking the drug that makes him transform to hyde. however he can still reverse it quite quickly.
He begins to worry that he had lost the power to choose to become hyde . Hyde was now making the decision: "i was slowly losing hold of my original and better self"
this is why he took double the dosage of the drug to keep Hyde in check
the drug made him feel happier and younger "i felt younger"
He is faced with a dilemma, Be Jekyll or Be Hyde. Jekyll would have to live a good life and act like a victorian gentleman and follow rules however Hyde can commit crimes and it makes him feel happier to be Hyde
Jekyll gets sicker and sicker and runs out of the potions. he commits suicide as Hyde is saying that Jekyll has died