No. You will feel terrible, your blood pressure will be so low that your vital organs begin to fail and you will be too delirious to know what is going on. In reality, most people don't ever develop this unless they have other problems or come into contact with a bad bacteria and avoid antibiotic therapy. There is little reason to worry about this; if it is consuming you i would suggest therapy.
You would never know. By the time you get even close to septic shock, you would be too sick to realize it. Sepsis, severe sepsis and septic shock are a spectrum of a disease process that progresses from a serious infection that creates a systemic (all over the body) organ dysfunction. You would experience fever, rapid heart rate, sweating, delirium, low blood pressure, rapid breathing, etc.