I've been sick for 3 weeks. for the first week i had a sore stomach annd headaches. then the second week i was coughing and this week when i cough i gag and feel like throwing up. yesterday the wierdest thing happen. all of a sudden i felt light headed and i felt pressure in my head and i felt weak and i was gasping for air. then i knelt to the ground and laid there for 2 minutes and got up and felt better. but i thought i was going to black out or die. do i have something serious. im going to the doctor tomorrow maybe..but just tell me something true of what it could be. dont tell me i need to see a doctor. i know that.