I received a letter from the Dept of Work and Pensions regarding the changes in PIP law and I would like them to consider and look my social support that I had in the past regarding my mental health problems that I had from April 2016 which they dismissed then when I made my claims back then and would like to know how I begin to write a letter to ask them to look into this and what happens when they do this and what exactly are they looking for and considering as evidence as I did have depression and still have since 2016 I just do not know where to start, this letter is making me anxious and has raised my anxiety I'm really worried about it, please help