I noticed some stringy type things in my poop today.  The poop was solid, but when it came out, each piece was attached to the next one with yarn like strings. They were the same color as the poop.  It looked as though I had eaten brown yarn and it was running through the poop.  I have had stomach pain and slight constipation lately... but I have IBS and my stomach always hurts and I am often constipated.  Should I be worried about this?