Doctor medical form

Hi there, I am currently in the process of appealing my Pip decision in which I scored no points, due to me mixing my home appointment up and not hearing the front door. I am finding this all quite overwhelming hence haven't actually sent the appeal letter off yet(I have a couple days left)
I suffer from depression, PTSD lost my teaching job 10 years ago due to breakdowns, I have been on ESA since. I asked my doctor if the would fill in the medical form for me. I have had to pay, and the doctor has filled it in in one day, marking my difficulties as moderate, depression, PTSD and fybromyalgia. I am currently waiting to see a psychologist (next monday), the doctor hasnt put this in. Is it even worth me going through this?
Part of the reason given for the turn down of the mandatory recon was that I manage to take my adult ASD sons to thier appointments (I don't I stated in a letter that I miss their appointments too)
I have been with my doctor for 2 years. I don't feel able to challenge them myself. I am very much affected on a daily basis, and know that if I was chucked off ESA I wouldn't manage the going to the JC, the regularity, the people. It would probably push me over the edge.
I suppose what I am asking does my situation warrant continuing the fight? Incidentally when the refused my mandatory reconsideration they sent me a WCA form to fill, also due this week. I just can't seem to pick myself up off the floor so to speak.