I need some quick help with a breathing issue. A couple weeks ago I had a slight sinus infection. After that cleared up I still had a lot of mucus in my chest and I was constantly coughing crap up. I noticed I was having issues breathing during workouts and long runs but I figured it was from all the crap in my chest. I started taking Mucinex and it cleared out the mucus but I still feel like I can't breath well. It almost feels like someone is pinching my throat at the bottom of my neck and the airway is restricted.
Last year I was able to run sub 1:50 800s pretty consistently but last week I could only manage a 1:51 and I felt like I was hitting the wall with 300 to go. I felt dizzy and I was out of it for the next hour after the race. Yesterday we had a workout on the track and I felt that same dizziness from lack of oxygen after the workout. What the hell is this? I take an inhailer before workouts so I don't think its asthma. I take singular and allegra each day for allergies. Whats the deal?