plus...
what kind of shoes are you wearing? I was wearing mtn bike shoes on my road bike and found them heavy and hot. Make sure you have some ventilated road bike shoes that fit you correctly.

Even then, if your toes are numb or your feet get hot, best remedy I know is to take the shoes off at rest stops, walk around sock-footed, etc.

Also, while riding, be sure to wiggle your toes and move our feet around in the pedals. Good luck! Foot pain is the worst.