Nausea and Cystic fibrosis

Everyday for a while now i have been nauseous then when i went to the bathroom all i did was feces. This is controlling my life. I have fear of going everywhere because i always feel sick, could this be something serious or mild? Also i was wondering if it could be anxiety. I have accessive sweating, and clammy or cold palms & feet. i've had the sweating issue ever sense seventh grade, no prescription deodorant has helped. I have cystic fibrosis, Diagnosed with it at birth, could this have anything to do with this? The feeling starts off in my throat & works its way to my stomach, I am on prevacid and zantac, but they don't seem to be enough for antacids. This feeling is ruining my work at school, work life, and home life. I can barely get anything done. I really need help ! Also When i get this feeling in my throat & stomach i feel like i have to breathe really heavy. PLEASE PLEASE PLEASE, tell me what this could be.