OP have you ruled out Visual Stress? Sometimes there's a confusion between the two and many opticians will be able to do some form of visual stress testing. It's certainly worth comparing your symptoms and those that this form of visual dyslexia creates.
If there's any doubt, and you want the best assessment and solutions I'd highly recommend the chap who's basically written the book on dyslexia and visual difficulties - Professor Bruce Evans. His practice is in Essex which isn't ideal for you but if you ever travel it might be worth a look in.
What will it achieve if you find out that you have dyslexia?
There is a lot of support available to dyslexic students. It can even be as simple as printing handouts on different coloured paper to ensure the material is accessible.
For some people blue tinted glasses help, I'm sure you knew that.