No offense dude, but if your fight is in Dec, it's a little late to start on conditioning...
A trainer gave me a really good tip on getting your overall conditioning up especially when it comes to battling fatigue. It involves sprinting.
In the morning and afternoon do this drill:
Sprint your ass off for 20 seconds. Then jog for 30 seconds. Repeat 4 more times.
After at least 4-5 days, increase by 10 second intervals, but keep your jogging at only 30 seconds. After a few weeks you'll be sprinting for a minute and still going as fast on your fifth rep as you did on your first.
I'm a terrible runner and I found it did wonders for me especially when I spar. I got much less tired and felt very little aches the next day after training. The beauty of it? It takes very little time to complete, that's why you can do it twice a day.