Can long term stress and anxiety cause bad digestion and daily nausea?

Hello. My problem started with nausea. I was at work and thought I was having a panic attack and threw up. It has been 5 months since then and I have constant nausea,vomit sometimes, mucus in stools, migrains, anxiety, depression, feeling weak and just very unwell. I am only 19. I have had a barium test, 2 gallblader test, ct of the stomach, colonocopy, endocopy, and blood test. Everything has came back good, as they say. Before all this happend I had alot of stress, a new son, job i hated, house burned down and just life. 2 docs told me it prob. was depression or a mental break down. could long term stress mess your diestion this bad? Even after I sleep all night I wake up with nausea. I always worry the worst and I want to stop and take my life back. If someone has had this prob. or studies in this please share. /Thank you.