If the nosebleed reaches the stomach without any deliberate action on the part of the fasting person, it does not break your fast.

There is nothing wrong with simply rinsing out the mouth while fasting so long as the water does not enter the throat of the fasting person.

There is no harm for a fasting person to taste food as needed. If they accidentally swallow it, there is no sin, and they can continue their fast.

There is nothing wrong with a man playing with his wife, or a wife with her husband, by saying words while fasting, on the condition that there is no danger of either of them climaxing. It is permissible to kiss and play with one’s wife, if one is sure that there is no risk of reaching climax.

If doctors say that the enema is like food or drink, then it should be classified as such and thus it breaks the fast. If they say that the enema does not give the body what food and drink give it, then it does not break the fast.

Whoever thinks about sex and ejaculates, or has a wet dream and ejaculates, that does not invalidate his fast, but he has to do Ghusl from major impurity.