Proponents of colonic hydrotherapy or colon cleansing would argue that harmful by-products of digestion can irritate and worsen the tissues lining the colon, including the anal canal where internal hemorrhoids form. Everything I've seen would indicate that this is not true. What is true is that once tissue is damaged, such as occurs with the tearing of the anal cushions (aka internal hemorrhoids), or the tearing of the mucosa (lining of the anal canal and rectum), that bacteria can invade these tissues causing pruritus ani, or anal itching. In the case of fistulas (bored pathways that can seal causing a sealed infection), this bacteria can be problematic. From what I've read, however, colon cleansing will not remove bacteria from these areas that are buried deep within the tissue underlying the anal canal.
Your fear of having bowel movements is understandable with regard to your hemorrhoids. It is indeed the passing of hardened stool that scrapes against the inflamed and prolapsed tissue, tearing at it, causing it to bleed and pulling it further down the canal, making it worse. This is the precise reason why hemorrhoids are chronic in nature. The body attempts repair and with each passage of stool, more damage occurs, causing a tug-of-war or results. Unfortunately, even under the best of circumstances, hemorrhoids cannot fully heal for weeks. Clearly, you can't avoid passing stool for that long. What's worse is that if you hold it, when you do pass the stool, it will be harder, firmer and cause more damage than if you didn't hold it. The key is to take all necessary measures to become more regular by softening your stools through the gradual increase of fiber and liquids in your diet.
Once you've got the digestive tract working smoothly, it's time to figure out the best way to tackle the problem long term. There are many solutions, both surgical and home based. They all involve measures you have to take at home, however, included hot and cold therapy and alterations in poor habits that may be worsening the situation or causing it to begin with. Learning what hemorrhoids are, how they form, what triggers them, and how to deal with them both short and long term is the best thing you can do. Don't ignore them, once you have them, they are will only remain or worsen with time if you ignore them.
Good luck.
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