Morg is great for taking a defensive stance vs Blitz since you can nullify his hook with your sheild. Or you can play a tank that out classes him and dare him to pull you. Then thank him for getting you close to their ADC and do your thing.
When you have to pick first, and you're stuck with a healer like Raka or Nami into Blitz ... One thing to remember is that once hes landed his combo he's kind of done anyway, so if your ADC gets caught - throw everything you've got at the enemy ADC and try to back them off. Don't waste CC on blitz even though its tempting because he is likely closer and stationary. He's only got auto attacks left anyway. Unload onto their ADC and keep them busy - since that's where their real damage is going to come from. You may lose the trade but you should both survive.
If you're about to get caught yourself. Use flash early - don't hesitate. Nothing worse than taking 70% of your health in damage - and THEN flashing to get to safety. If you have flash up use it as soon as you see the hook is destined to land. And when he misses a hook go as aggro as possible. Zone them right out of CS.
Its a stressful match up for sure (I tend to ban blitz if there is no other counters to my pick). But if you come out of lane even, Blitz offers much less than you do in the late game so you can consider it a small victory :)