PIP Appeal

Hi all,
I am new to this forum, but have been following and reading the useful posts for a while. I am struggling with how to fill the online appeal form and was hoping someone here maybe able to offer some guidance. I suffer with pain, stiffness, fatigue, low moods largely due to joint problems caused osteoarthritis.
My mandatory reconsideration of PIP was recently refused, largely based on the fact that I drive an unadapted car and I am able to make a 5 minute drive to work 2 times a week and make other short trips to visit family a couple of times a month. They deduced from this, that it means I don't have any mobility issued. Reading the forum posts and the various useful guides on this forum, I know this ground for refusal is pretty common.
My condition has got worse since I first applied over 6 months ago, in that it has spread to other joints, and I am currently being investigated for rheumatoid arthritis and other autoimmune conditions, so I am thinking to appeal and put a new claim in at the same time, as I am aware that the appeal panel may not consider any new conditions, unless I can successfully argue they were always there.
I am trying to follow the format in the appeal example guide and I am just wondering how I would insert it into the online appeal? How have other people approached it?
Thanks in advance and sorry for the long post.
Marie