My Stomach Started Hurting In The Mornings About 4 Weeks

My stomach started hurting in the mornings about 4 weeks ago and it got so bad I started getting sick in the mornings. Some days I feel fine after I get my day started at work but other days I am just nauseous all day usually when the pain sticks around all day it turns into cramp pains. This only happens on the weekdays. I am under a lot of stress right now with my dad being diagnosed with colon cancer, I have recently quit smoking, and I am starting my own business.