possible Pneumonia or flu?

my girlfriend is extremely sick sometimes she acts pretty well but other times she seems on the verge of death ( not literally) this is the description she gave me., "my head is killing me to the point where i can not lift my head off the pillow. ill cry thats how much pain im in. everytime i stand up and i get very dizzy and light headed. then i throw up yellow stuff ( thin fluid that appears yellow. was dry heaving when this happened). everytime i take a deep breath in my chest hurts between my boobs very bad its like a sharp pain..and that only hurts when i breath. my head hurts constantly and sometimes i get bad pain in it and it won't go away. its in the center of my head like where my brain is not on my forehead. my mom had tried giving me exceterin,aleve, and naisal decongestant. and no help." note she went to the hospital they ran EKG, Cat Scan of head and chest, and blood tests were ran nothing came back with any results.they cleared her but i plainly saw her in pain and dry heaving and could see the exhaustion in the way she acted. please help

[shellbean116]

the dizziness and headache are probably dehydration from the vomiting. the vomiting and pain sound like a hot gallbladder. with chronic gallbladder problems the gallbladder can flare up and calm down then flare again which maybe why she has good days