Some soda - makes me sooo hungry and makes my pouch very insensitive to full/empty signals. Other - like  brand name diet tonic (the one with aspartame as a sweetener) does not do that. 

Also- diet soda like Pepsi or Coke or Sprite zero - irritates my bladder and ..I become semi "incontinent".  stopping diet pepsi for a week - fixed the issue.... 

I may drink one (1) small diet soda a week without noticing its effect on my bladder... 

Miralax is the only thing that really work for me painlessly. 

I had to increase to pain that I was having daily runny BM for a 2-3 days - then slowly decrease my daily morning dose when I have BM everyday - and it is neither hard or too soft. 

on days I feel I did not have a complete BM I may add some extra Miralax (1/3 cap full) or evaluate if I drank enough water and ate enough food.

Fiber constipate me.  Some of us - too much fiber may have just the opposite reaction to the one we wish for.  I had to make sure I get enough fat in my diet - low fat diet - constipate me...

There is even study that shows that some people do much better with low fiber than high fiber diet. 

"Stopping or reducing dietary fiber intake reduces constipation and its associated symptoms"  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3435786/

One of the other members had a ferritin of 6, which is dangerously low. She was taking a few hundred mg of elemental iron every day for a year, and the ferritin didn't budge. After three months on the patch multi, and an extra iron patch, her ferritin is already up to 28.

Hi! I don't have an answer, but just wanted to suggest you post this on one of the main boards. This one doesn't get much traffic! 

I recommend that you start using something like MyFitnessPal to track everything you put into your mouth. It'll be easier to troubleshoot what's going on if you know what's going in :)