What I tracked with my Severe Crohn's-Colitis:
Bloating, Gas, Cramps, Energy, hrs of sleep, Stress level, Bowel Movements (# and quality so D or formed etc), what I ate, physical activities, sex drive, joint pain, supplements, protocols, etc Feel free to add others that may pertain to your situation.Then I would put an overall rating out of 10 how I feel in general.
-So for each tracking measure I would rate things from 1-10 but this changed for negative things like cramps 10 would be the worst and 1 the least.
As you begin to heal you will notice that many of these items will fall of your list as they will no longer be an issue. Also in the beginning I tracked all foods I ate daily but after the first year or so I knew what I ate without issue so I did not put every item I ate. I honestly think it would be best to keep track for 1.5-2 years as this is a full healing time for IBD's.
Hope this info helps and if anyone has any tips or comments make sure to leave your input.