You may have installed too many modifications at once..? Try removing all of them and installing them one at a time. This may help determine if one of the mod packs is the cause of the crashing.
Also, check your particles folder for any _1 or multiples of particles, just in case.
Hopefully the issue gets resolved!
~ Whisper
Thank you! I will try to uninstall one of my mod packs. I've always used GoldChocobos lion animations and Unuuk's canine animations, but I suppose they aren't compatible with the update? Which is a shame. I also installed a new map that had pretty big effects. I suppose that might also be contributing to the problem.