I drank 8 beers Saturday and have an EtG today at 6 it will have been 42 hours without drinking, I drank tons of water and grapefruit juice. Will I pass

Possibly. It will be close.

Is there anything else I can do? I'm freaking out

What can you do? Hope for the best, I guess. If you drink too much water, you will fail for dilution so there's not much else to do.