About 1-2 times a week i get a stabbing pain in my left side under breast. it can be severe enough to not breath but only for maybe 10 secs. normal?

Normal? No: While such a pain is not "normal", it is unlikely to be anything serious. Many pains like this simply pass with time and simple anti-inflammatories (aspirin, ibuprofen, naproxen, acetaminophen) are worth a try. Signs that it should be looked into further include worsening frequency or intensity, associated cough, fever, shortness of breath, masses or swelling in breasts, local skin changes, etc.

NOT norma.l: Not normal. Can be as simple as a strained rib muscle or serious like a cardiac problem or breast issues. Please see a primary md.