Help regarding PIP assessment

hi I need some help regarding PIP assessment. I requested my pa4 form as I have been waiting a long time for a decision, my form came today and I have read through it and I totally disagree. I have spinal stenosis with nerved impingement which causes a lot of pain and I find it hard to stand and walk. in my assessment I sat down during it all just repositioned my self at times just because   I wasn't shouting the room down in pain she put down 'didn't seem in pain in the assessment' I had my 3 year old with me and continuously put down that I 'bent down to reach things from the floor for her son' yes I bent whilst sitting in the chair not bent down standing up which she forgot to add. and she kept on saying that throughout the report. I know this claim is going to come back and not be entitled as she has not explained things I said and missed things out can someone please reassure me and tell me what am expecting.