My immediate reaction to your post was to change the solution of your cleansing enema. Use a saline solution (2 teaspoons of non-iodized salt per quart of water) instead of just plain distilled water.
After taking the coffee enema take another cleansing enema to clean out the coffee and toxin residues.
I am on a similar protocol following Dr. Sherry Roger’s book: Detoxify or die. I had the gas problem when I started but now 6 months later the gas problem has gone.