1. "been" doesn't really work without "has". Typical sentences include: "Where have you been?" "What have you been doing?" 2. "has" does not belong in such a sentence. You should instead use "had": "I had written, asking..." "I wrote, asking..." 3. When expressing what you felt at that moment, you use the simple past tense: "I wrote the essay yesterday after I sat down at my desk." When expressing what you felt while something was happening, use verb+ing: "While writing the essay, I felt inspired." (the verb+ing is always used with another verb, a past tense verb)

For question 3, using the present tense to narrate a story in the past occurs in spoken English, but is rarer in writing. "It's raining hard so I walk into this bar to stay dry. There's only one seat open so I take it..."