It is okay to have a mopey day in your jim jams now again, just don't let it become a habit.
Remember as I told Cas, a very wise lovely lady here told me that you must show control but don't be difficult so yes you should answer the email this afternoon. Your answer is sufficient, to the point and business like.
Definitely go and get your tax done, because you will get your refund in 14 days and you could use the cash. I have to do mine as well but I am always the one that has organised both of our returns at the accountant.