There's no point in killing yourself just to be slim. I was a "chubby kid" and am still working it off myself so I know that you don't want to go back to that, but you're hurting your
body. Worse case scenario, you could end up killing yourself. What if you're running on the
treadmill, pass out and bang your head? Plus what if the nausea develops into vomiting? Vomiting is never good because it damages the internal organs.
PLEASE stop doing this. Nausea, feeling faint, etc is not a sign that you're on the right path.