HI. I have had pain on the left and right side of chest ( near ribs ) since may 2015. I went to my doctor, and he said there is nothing to worry about, after he looked at the electrocardiogram. He thinks that the reason is stress. ( sorry for bad expressions, English is not my native language)

So i have been experiencing new types of pain, kidneys ( left and right) , shoulders(rare), and little pain in stomach.( like getting stabbed with a needle it barely hurts in the upper quadrants left and right near navel.)

1 week ago i saw blood in my stool, and i had big pains in abdomen and i had diarrhea. It happened only once. Today i had the same symptoms, i wasn't sure if there was blood in feces, but i saw bunch of white lines.. it didnt look like worms, just white lines...

I hope i explained well my problems...

19 year old Male.
Thanks in advance.