A week and a half?
Theres just no time to get your cardio improved. For that matter your skills cant be improved a whole lot either.
I read alot of lay and pray advice and for once I cringe at myself for agreeing with that technique.
In the future if you plan to fight more you can do it without a gym. You do need to come up with a training regime that will help you. Get a partner to train with you and do rotations of wrestling, grapling, boxing, and submisions. Do 30 minutes of each on your first rotation then cut it to 15, 10 and 5. Only break for 5 minutes between roations and 30 seconds between skills. For cardio do the wind sprints and if you can swim laps in a pool. The cardio will also come from the rotations.