I started taking BJJ last month and I gas really quick, especially when we roll at the end of the session. I can roll with two guys, but then I feel really out of breath, and my muscles feel extremely weak. I'm even dizzy. What can I do to increase my endurance? I'm like 5'11" and 185 lbs, and pretty muscular so I don't think it's a strength issue, although my muscles do hurt afterwards. Is it cardio? I'm not eating the right thing beforehand?
Edit (about 2 months after starting):
This question is generating a lot of good input. I'd like to give an update that might help anyone that comes across this question. After about 2 months of rolling (4 days a week), and a few private lessons here's what I noticed.
1. As I gained a bit more tools (from classes, and especially private lessons) I exerted less energy when rolling because I was focused more on technique and not trying to muscle out of every situation. BJJ is more like chess than a show of brute strength. It's all about position and leverage, not strength.
2. I started taking BCAAs. This helped with muscle fatigue a ton.
3. Training hard every day really does boost your cardio. I'm gassing a lot less than when I started.