I can’t comment on the work front as I’ve been unable to work for years due to increasing disability.
With regard to PIP though I recommend you have a look at https://www.benefitsandwork.co.uk/ They have a free PIP test and some general information about PIP. If you think you might qualify, it’s worth joining the site. Their guides are available to members only but are excellent.
Alternatively, look at Personal Independence Payment - Citizens Advice
I disagree with GCCK about it relating to your EDSS score. It’s more about your need for help with personal care (the ‘care’ part of PIP), and your ability to walk / otherwise mobilise alone (the ‘mobility’ component).
It is vital to get written evidence to back up a claim for PIP, so you’ll need any documentation you already have from medical professionals or you can ask for letters from your MS nurse, physiotherapist or other professional(s).
Best of luck