Minor head pains, fatigue and the feeling of a nose bleed

Hi every one, I need some help here in possibly finding out what is wrong with me. Months back possibly 6 or 7 months ago I was working out with my track team. We did a hard interval workout on the out door track it was pretty cold I'd say low 40s possibly lower. After running we went inside to lift weights and workout. I felt perfectly fine lifting weights doing pushup and the crunches. Eventually we started doing jump training. This is where I first ever felt this pain/sensation. Basically I jumped up I'd say about a feet into the air to get on top of a block then jump back down, the second I jumped up into the air I felt a terrible pain inside my nostrils and inbetween my eyes it felt like I was having a nose bleed. I jumped about two more times and felt the same feeling. I walked to my coach and told him I can't do this I think I'm having a nose bleed. It turns out I was not having a nose bleed it just felt like I was about to have a nose bleed every time I jumped up even in the slightest of altitude. Coach said not to worry just sit out out for the rest of the work outs and that I probably just feel this way because we came in from the cold. Soon after I felt like I was going to pass out and I had a minor headache throughout the rest of the evening until I got home and took some tylenol. Ever since that day up until now I have had the following recurring symptoms light headedness fatigue pressure around the face and sinuses random pains in my head and no matter when or where I try it if I jump up I feel pressure in my nose and I feel like I'm about to have a nose bleed yet I never get one. I don't have any clue as to what can be wrong with me and thats why I need some help and info as to what can possibly be wrong with me. These symptoms are almost always a constant since that day I've first experinced any symptoms months ago. I also want to let you know I have been working out consistently since then doing push ups sit ups and running although I often suffer from these symptoms. I went t to my doctor about a week ago and told him my story, and he couldn't really find a "problem" so to speak and told me something about possibly a sinus infection then gave me a couple of boxes of nasal spray It has done nothing for me! Please help me with any information you can give me about my symptoms. Thank you. Also I should add that I am 20 years old I weigh 155lbs and I am 6'0