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Are you keeping your stools soft?
Well, obviously it it very important that you avoid straining, as this increases swelling in the anal canal due to increased blood flow, narrowing it, and making it more likely that the stool will keep reopening the fissure. Straining also increases muscular tone in the canal, putting further pressure on the fissure. So it is best to keep the stool with form, but loose, and allow it to come out on its own timeframe. ANother thing you could consider is inserting a suppository just prior to any bowel movement. Some people use glycerin suppositories, some use hydrocortisone ones (with an anti-inflammatory). This can help to prepare the anal canal for the stress of stool passage.
These suppositories are available over the counter. They can be used with nitro but are best used at least 2 hours before or after.
Total healing may take 10 weeks, but improvement should start within a few weeks. The amount of nitro used is typically small and does not get into the bloodstream much, so it is usually safe to use. However, if you are not placing it into the canal then you are not benefitting from the lubrication effect. If your doctor or pharmacist instructed you to not put it into the canal, then you can use the glycerin and/or hydrocortisone suppositories for this purpose.
Yes, you should treat or retreat until it is 100 percent better, unless your doctor tells you otherwise.
If you treat the spasms and the inner inflammation at the same time, it should heal faster, as they are inter-related.
Yes, you could alternate nitro and cortisone. You could also use lidocaine as directed for pain when needed.