PIP tribunal date confirmed

So, I've had my tribunal date confirmed. Fair to say I am absolutely terrified. Not sure anyone can say much to ease my worry, just figured this was a safe space to vent and people may understand my fear. 

I am autistic and so far have just been tied in knots by the people I have spoken to throughout the assessment, MR etc. Part of my disability is being unable to communicate very well verbally so it is easy for them to confuse me and me lose track of what I'm saying. I feel I have done very poorly so far and will just mess up at tribunal. 

My partner will be there with me (on the phone) but I don't think she is allowed to actually answer anything? I am so scared and already having meltdowns and panic attacks about the call. I am pretty sure i will just cry and struggle to even talk. Which is never going to help them understand anything. 

Anyway I guess I just wanted to vent. The letter says it will start with them introducing themselves. I don't know if I will then have to introduce myself but even that terrifies me. If anyone knows if there is any kind of structure beyond the introductions that would be great. Will they focus on the points I have disputed? Will they generally talk about my claim? Will they want examples again? Will they ask specific questions or just ask me to explain? Literally any information will really help me to plan for it. The only thing that can in any way ease my anxiety and panic is to know as much as I can about what will happen (I appreciate a lot is just going to be unknown). I will research autism and tribunals as much as i can to try and feel in some way ready. 

Sorry to offload! I have put so much into this process I'm just scared I do what i did on the MR call and just don't explain very well at all.