Published on 12, July, 2020
I went to the Adele concert in Wembley a few years ago that had around 90,000 people so was on par with Taylor - it was really well natured and only really had long queues for entry which it soulds like you have sorted.
Once inside you can buy refreshments so should be able to get water there to keep with you - if security give any grief then show your lanyard and tell them you are disabled and need it so they let you through.
Do you have any anti-anxiety meds that could help you on the day? Something non drowsy obviously is ideal but since it is such a time limited event it may be worth considering.
I find with concerts it really helps to try to move into a different frame of mind to our normal "survival" mode out in public. Everyone there is out to enjoy the music, share the pack mentality and just have fun. If you can try to get a bit more "hippy" for the evening and let your barriers down then you may find the focus of the music- loud though it is - can be part of the enjoyment.
I love big rock concerts for this reason - there is a real sense of camraderie with the other people and you often strike up unlikely friendships with people over it.
Overall focus on the positives and now you know how to deal with the potential downsides then you can just deal with them and enjoy the rest.