I'm asking this question because I was having severe sinus problems last night and all throughout this morning and I felt like I also felt like I lost my concentration and started thinking negatively so I wondered if this went hand in hand with being sick. Also here's a bonus question, when you have nothing inside your stomach, why does your body feel the need to throw up phlegm? And a second bonus question what exactly makes us vomit (besides germs) in the first place?