A possibility that it could be, based ony your posting, is that it might not be your intestines, but your liver/gallbladder. Esp. if the pain is upper right quadrant.
You said you feel gassy/bloated/etc. and this might indicate indigestions due to bile blockages or gallbladder secretion issues. This could be made worse if you also have high fat meals.
I would focus on high fruits/veggies/greens (lettuce, spinach, kale) and cut down or out, dairy, meat, grains. Take 1 gallon of purified water per day.
Look into a good peppermint/dandelion tea and try 2 cups daily.
Also, you may look into cleansing your intestines which may remedy the problem, also. If so, check this out, may be of interest.
Colon Cleansing