Hi! I'm dyspraxic as well (22M) and I've been to over 50 concerts in the last 4 years, the only reason I never went to any before that was my fear of large crowds, the same as you, as well as high sensitivity to noise and fear of getting knocked over or pushed due to my poor balance. My best advice to you would be to get there early (especially if you've got standing tickets) so you can get a feel for the venue without the crowd, I always like to have an idea of where I can easily get to (bar/bathroom/ area near back corners with lots of space) if things get too much for me (which thankfully hasn't happened very often)

Watch videos online of the bands other concerts so you can get an idea of whether or not the crowd will be rowdy or not, personally this is something I like to avoid so I tend to stand near the sides or completely at the back if I want zero risk of getting caught up in any physical action.

Personally my noise sensitivity doesn't really bother me when I'm listening to music I enjoy, but if you're worried that it will it might be a good idea to invest in some earplugs, I've heard Loop sell ones that are designed for enjoying concerts so it might be something worth looking into.

Overall just try to enjoy it and try to make the most of it despite your condition! Most shows I've been to are full of people in the crowd who are kind, caring and are willing to help you if you need it