Re: painful knot - maybe blocked w/ stones?

Have you tried an enema?
That is the first thing I would have done in case of constipation.
All other symptoms you listed could be related to constipation.
Clean water enema is the best way to quickly evacuate bowel.

You should never be constipated longer then 36 hours. If you have not had any elimination for longer then 36 hours, and you have eaten 3 meals a day, then you need enema or Epsom Salt very badly!
Flusherman