esa tribunal

I received a date for a esa reassessment appeal on sat for the 12th July. I was put into the wrag without a medical for fibromyalgia,osteoarthritis but looking at the notes receivedf with appeal info, it doesn't look as if my depression/anxiety has been taken into account at all. I had enclosed a letter from my doctor and cpn at mental health. I had appointments to see both for further letters of support but not until the 3rd + 5th which is too late to get to appeal a week before. I also wanted to see if i could get someone to represent me. I phoned to see if they would be considered on the day which is unlikely but was told I could ask in writing for a later date. do you think this would go against me or evn be considered?