My pains just starting on my rite side above where the belly on is?

I am VERY stressed and under alot of pressure emotionally, mentally, physically...so I have had a really hard day today and my side below MY right and above the belly on level right below where my rib cage ends started hurting and I have no clue what this pain is...an ulcer, my gallbladder, an appendicitis? Help. What is wrong with me?