Loud heart beat, Asthma, Unknown symptoms please help?

When I get out of breath from running (and that's pretty quickly) I get really dizzy, I am out of breath, I can feel/ hear my heart beat in my head (its really loud). My temples are *booming* and I feel Like I`m going to faint, I also loose balance.

I`m not overweight or anything like that my bmi Is perfect but I do suffer from asthma, Are those symptoms parts of that?

You are just probably hyperventilating. When you run/exercise, it makes your heart race. That is whh they call cardio exercise. Whether you are in good shape or not, you breathe a bit faster when you are exercising. Sometimes you may breathe too fast and because of that you blow off too much CO2. CO2 is a vasodilator. So when you blow off too much it causes your blood vessels to constrict especially around the brain. This is what causes dizziness. Asthma could play a role in it, but all of your symptoms could be just from exercising. When you feel dizzy, take a break and catch your breath.

I seriously suggest you get yourself to a doctor ASAP.

I am not trying to worry you but my husband's heart was so loud I could hear it just lying next to him in bed and he had a very leaky aortic valve. Please go and get yourself checked. My husband had to have a valve replacement.