i suddenly feel extremely tired and dizzy. ive had a cold for a few days now and the only symptoms ive had today are a hoarse voice, coughing and congestion, and stuffy nose. i felt weak when i got up this morning, took the garbage out, vacumed, and thats when i suddenly got extremly tired with a weird pressure in my head. i feel dizzy and faintish if i move around, any idea wgats going on?