Acatenango unprepared

So basically I had to move my flight date and trip earlier due to work. I can’t cancel anything at this point. I’m going in a week and the only option for the hike starts about 9 hours after I land. So I’ll probably get 7 hours of sleep.

I’ll have almost zero acclimation and I’ve been sick for a week or two so haven’t hit the gym. Am I screwed?

I’m going anyways because it’s all non refundable but realistically is there anything I can do to prepare at this point or should I just be ready to suffer?