I am homeless nfor 3 weeks, i am tired,fitigued, light headed,aometimes I feel as though im going to faint, a little trembly at times. I probably dont eat enough or drink enough .,Situtation is temp......I am HIV poz, Diebetes, and have depression. I have a big load bang that happens in my head and it makes me jump,as i never know when its going to happen, i went to the emergency room, cat scan,ekg, upper cheat xray,blood and urine did not show anything wrong but it persists. Could this just be stress ?