Fizz counters vlad really hard, kiiinda short cd burst that applies grievous wounds and does dot, while vlad kinda just Q's until post 9. Building HP/magic resist earlier on will help, because fizz is bursty, so surviving the initial burst is needed, and magic resist will make him hurt less overall. Only other thing you can do is outplay the fizz. Your pool completely dodges his ult when he hits 6, which may be worth remembering, and it dodges all his abilities in general, only problem is it's on such a long cd. Your built in sustain is what fizz counters most, so farming under the tower is going to be needed, only problem is fizz can tower dive all day. There's not much you can do against a good fizz as vlad.