Did you ever consider you may have hemorrhoids? These are varicose veins inside and sometimes outside your rectum. Essentially, every surface vein on in your body can become varicose. Sometimes they fade away but often when they are repeatedly irritated they can become more swollen and often bleed. This becomes the precursor to having a fissure. Having a diet poor of fiber and lack of exercise is one of the highest contributors to this. If you spend most of your time sitting in front of a computer or watching TV, I guarantee you have hemorrhoids. Sometimes using a large toy or plug will push the blood flow away from the surface in the same way compression stockings reduce varicose veins on legs but this is only temporary.
https://www.dealwithhemorrhoids.com/the-differences-between-internal-and-external-hemorrhoids-pic/
Frequent enemas with tap water will make hemorrhoids worse since they draw the moisture away from your epithelial tissues and eventually they become irritated and less able to produce the normal mucosal lining. When this happens, you need to pay good attention to what lubes you use and what's in them. Most water based lubes are designed for vaginal sex and work with the woman's natural fluids. Rectums/anuses don't have this so these lubes can be absorbed into the lining causing more irritation and swelling. It's always best to wait at least an hour after flushing before any kind of play. Also, like previously mentioned, avoid NSAID pain relievers and anything else that thins your blood (like alcohol). If you have discomfort and slight bleeding, try filling a slender water bottle filled with very cold water and slide it up there. Don't use ice water – too cold and too risky. Later try using Tylenol (not an NSAID) to reduce the swelling. If the bleeding is really bad and doesn't slow down, you need immediate treatment before you get sick. Like septic shock sick.