I've had MS for nearly 15 years. Which benefits can i claim please?

Hello @emz1024 and a very warm welcome to you. Sorry it has taken a little while to respond.
To establish what benefits you might qualify for you could try this online benefits calculator. Perhaps you could give that a try? We also have a lot of other resources and some excellent advisors, so if you get stuck or need to ask any questions don't hesitate to ask.
Warmest best wishes to you,
Richard
@JennysDad