Started my TXR174 TMA.......

I managed to start my TXR174 TMA yesterday but I only got about 50 words of the introduction done.
I know what I am meant to do and I know what I am meant to write but everytime I sit down to do it the words just don't seem to come out.
I don't know what to do...It is almost as though I have writers block or something.
I know about 90% of what I need to do and I kind of know how I want to set it out and all that but the words are not coming to me.
It's Monday now and I wanted to have it done by Thursday as I need to spend all day Thursday on my TMA for T171 which is due in that day.
God!!!!! I just don't know why the words are not coming to me...I do have a bit of a distraction but that shouldn't be affecting the words and what I am doing but it is and I just wish that I can sit down here at the computer and for the words to come flowing out but they are not :O(
I am going to try again in a bit and if they don't come out I can do other things like work out how I want it all set out and get the other stuff together that I wanted to put with it and also keep looking over it as it might just come to me the more I look at it.
I know I can pass this TMA but I want more than a pass on it. I got 77% on the last one and I really wanted to get 80%. I know it is doubtful but I know that it is do able but if I can can do it is another story. I will be a little disappointed if I don't get 80% but if the work isn't up to that standard then I really can't complain. I am hoping to do a TMA of that standard but if I can do it we shall see.