THIS so much
I use Metamucil too. Just a little everyday to help.
I've also found that eating Apples or Plums helps to keep me regular and my poop not be loose.
You just have to eat a bit healthier overall. Avoid very oily foods and fast food.
Here is a rule I live by that makes it so I don't have your problem, OP.
I make myself eat at least 1 raw fruit or vegetable at every meal. Breakfast is usually an apple or banana and cereal. Lunch is a sandwhich and broccoli and carrots. Dinner is whatever and a side salad of some kind. >TL;DR Fiber