All of these sentences are grammatically valid, but for some of them the intended meaning is not at all clear, and they are not the way that most English speakers would express these ideas.
In general, "I feel myself" is generally understood to mean touching yourself for autoerotic pleasure, which is probably not what you mean in any of these examples.
"I feel myself badly." Sounds like you mean that you are unskilled at autoeroticism. If what you mean is that you are sick or unhappy, you should say simply "I feel bad."
"I feel myself well." Similar to badly but in the opposite direction. You probably mean "I feel good."
In general, "I feel myself" is generally understood to mean touching yourself for autoerotic pleasure, which is probably not what you mean in any of these examples.
"I feel myself badly." Sounds like you mean that you are unskilled at autoeroticism. If what you mean is that you are sick or unhappy, you should say simply "I feel bad."
"I feel myself well." Similar to badly but in the opposite direction. You probably mean "I feel good."
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