Hi, I am a 23 year old male, 6'0" 145 lbs. This past week I've been having bodily aches in my lower abdomen. Within the past 2-3 days it's gotten to the point where I now have a knot in the front lower left side of my abdomen that hurts severely by touch and some by movement, sharp stabbing pains in my navel area, sometimes directly behind or to the right side of my belly button, slight chest pains, and a bruise that has randomly appeared on the inside of my upper arm following a vein. The bruise came out of nowhere with no bodily harm having been done and appeared around the same time as the pain, and the knot came a day later. I've been really sick everyday for the past couple of days, throwing up and have been sleepless because of the dull achy and sharp pains I have to fight. It's just getting worse. Any help is very much appreciated. What can it be, and what should i do.