Could 30 min of asbestos xposure 3mo ago affect my digestive system? bloted/constipated/back hurts.

Unlikely: Asbestos is a small natural fiber, of which there are several types, used for insulation and other purposes. It rarely affects organs aside from the lungs, so i suspect your symptoms are related to something else. Even in the lung, the effects of asbestos are not usually noted until decades later. If you were wearing any type of mask, you likely have little risk of health problems.