I am dyslexic and have ADD. However, the documentation for my issues was destroyed 3 years ago at my previous undergrad (I am a non trad.)
One thing that helps me a lot is using a computer. I don't take hand written notes, everything is on my laptop and I type (the concept of letter/sounds is fine, it is the visual confusion on some of them that I struggle with) all my notes.
I do struggle with the time requirements of tests. It isn't that I can't answer the questions fast enough, it is that the dyslexia means I make really simple mistakes in reading/interpreting questions. So I may be re-evaluated over the semester break to get some accomodation (different fonts, larger type, perhaps more time.)
I did fail my histology practical; I was literally blinded by the microscope light. I knew it was a problem before, but didn't realize how much it would affect my ability to view slides in the alotted time (~1min per slide per quesiton.) So, after looking in the scope, it took about 30 seconds to have my eyes adjust to be able to write/read the question. Without the mandated accomodations, the instructor has been very helpful... he obtained a polarizing lens to help reduce glare (contrast as well, but it helps) and is willing to provide more time if I need it. I think it helped that I do extremly well on the written part of his exam and on the quizes which are displayed on a projection screen.
I can't advise you for your particular disability, and I recommend figuring out what accomodations you may need NOW and getting all the documentation together and organized before entering vet school. We cover a lot of material every day, but at the same time, most of the actual concepts aren't really difficult. It isn't like grasping principles and major concepts for the first time; it is more about identification, pattern recognition, and understanding the relationships between things (like GH and insulin.)