Symptoms - should I be worried?
This is the story of my last few weeks.
Sometime around my birthday (I turned 19 on the 6th), I began noticing some funny things whenever I'd eat. Being a teenaged male, I have a naturally huge appetite, and can usually eat a lot in a sitting. Around then, I began noticing that I was feeling sick every time I'd eat; the smallest little thing would make me feel like I was going to throw up. I chalked that up to being excited about my birthday, though, and it dissipated a little bit after the 6th passed.
The real concern came about on Saturday night. I felt perfectly fine all day, and hadn't experienced anything that I'd consider abnormal health-wise. Right before Hockey Night in Canada started, nature called, and I went to do my business. As soon as the bowel movement was done, though, I felt this searing pain in my lower abdomen and back; I thought I'd somehow thrown my back out while on the toilet (which actually wouldn't be the strangest way I've done that). When I went to wipe myself, though, I noticed that it was all bright-red blood; in addition, my stomach had gone down considerably (I am overweight, and usually can't see my toes when I stand up straight, but I could after this). I was scared, of course, but I didn't go to the doctor, because it might've been a one-time thing. It wasn't, though; with the exception of the pain, it happened again last night.
I can't go and see a doctor until tomorrow, but that's not stopping me from being very scared now. Could this be a sign of the presence of colon cancer, and if not, what could it be?