Tonight in class I literally thought I was having a heart attack. I rolled 3 times in a row and tapped out all three people but then had to sit in order to keep from puking. Then I rolled twice with a 170lb guy and tapped him out once, but halfway through the second round I nearly passed out. I literally couldn't move. and he quickly guillotined me. Then getting up I had such a splitting headache and inability to even find my breath much less catch it. I was done rolling after that which is absolutely pathetic. I have asthma, but there's gotta be something I can do to increase my stamina. What can I do?? I figure running is obviously the first thing on my schedule..but anything else to kickstart it a bit?