I've been constipaded for about 2 weeks , haven't been having the low bowel movement I and blackish stool for about 3 days . But then it stopped . And when I lay down I feel a pulse on my stomatch sometimes on the sides of my stomatch too, and i can see a pulse by my ribcage even when I don't breathe , Ihen i press down on it hurts , and I get stomatch pains on the side of.my belly , does it.sound like any type of condition to you ?