How do you play against himerdinger adc?

I've recently played against a himerdinger adc and I'm honestly just so confused on how you play against it. I play alot of Janna but I actually don't know how I can do anything against this champ. He's quick, he does a lot of damage, and if you actually do poke him not only does he have minions helping him but also his turrets. Along with that if he lands a stun on you, you will almost always die. Seriously what's a support counter pick? Or just in general, how do you play against this champion?
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