I’m in a hurry to answer you
"I’ve just received your letter and I’m in a hurry to answer you." (Meaning that I’m in a hurry because I want to answer you straightway)
Could you suggest something better than saying, 'I’m in a hurry to answer you.' In Russian/Ukrainian we really say 'I’m in a hurry to answer you.' 'I’m in a hurry to inform you.'
What do you most commonly say in this case?