Help flowers turning dark!

[Rugar89]

HELP! Caterpillar infestation, bud rot! Neem ineffective

First time grow, and I have been super attentive along the way, like most beginners. Today while looking over my healthiest plant, I noticed a 1 cm long green caterpillar, and starting poking around the buds. The more aggressive I was in digging through the buds, the more worms I found. Every bud has multiple little worms eating away and ruining my plant (maybe all 3 plants, I haven’t checked super close). I’d bet there are hundreds of worms in just one plant… Not super happy right now. Too…