Im on my 2nd month of JuJitsu and my stamina is lower now than when I started. I was rolling for 5 minutes without gassing but these past two weeks I have been running totally out of air within 30 seconds. And i mean where I almost pass out. It almost feels like a anxiety attack or something. I also think I might have a sinus infection. Not sure if that could be the cause or not? Maybe asthma? I have always had breathing problems(bad sinuses) while growing up but not near this bad. I am going to go see a doc next week. Any suggestions?