(The fourth doesn't hit me, my AC is 16 with the Force Screen buff up. It's been less than 10 rounds. I also haven't taken my turn yet because I needed to know the result of the counter-charge and AoO for my strength mod.)

In my turn, before those spiders act, I will Minotaur's charge the spider furthest from any other spider. I move without provoking AoOs and make a bull rush attempt, dealing 2d6-1 damage if it fails.

Then assuming up to four spiders can get to me, I'll AoO the first one.

Spoiler: Rolls
Show
Bull rush: (d20+1)[13](2d6-1)[3]
Attack of Opportunity: (d20)[5](1d6-1)[2]
Miss chances for the three that might hit me: (d100)[93](d100)[52](d100)[31]