There are so many issues "raised" in your posting that responding to them would be unwieldly and unreadable.
However, I am sure you are sincere, so suffice it to say that at least part of your concerns revolve around the concepts of correlation versus causation.
For instance, falling a great distance is correlated with serious injury or death. But is the death "caused by" the falling, or is it really "caused by" the impact?
This is NOT an academic point, it just illustrates pretty clearly that while "falling" may be correlated with death, it's really PROBABLY the impact at the end which "causes" serious injuries, both internal and external, which (together) CAUSE the death. While perhaps extreme, this example helps point out that, many times, events happen in SO MUCH TOGETHERNESS that one may "apprear" to cause the other. Certainly that is often true. However, sometimes things that "always" appear to happen together are NOT causative.
Your constipation "may be" associated with mucoid plaque and/or stickiness. However, it is MOST PROBABLY caused by another factor, perhaps one as simple as "reduced colonic 'motility'." I apologize if this looks at all "arcane." It's not, it's just that some of us who read it will say: "All that was obvious."
Unfortunately, for many reasons, some things which are "obvious" to some of us, are NOT "obvious" to the rest.
I hope I have been more helpful than most. Write to me, or call me if you wish.