I have no experience of Birmingham hospitals, but I’m sure others will fill you in.
With regard to your first appointment, to be honest, they can all be different (is this a first appointment with an MS specialist?). The only thing that seems standard is that the neurologist (similar to all first appointments with MS nurses, all doctors, all services) ask you to tell them what you see as your medical history. So they’ll want to know what your first symptom was and when, what happened next, blah blah blah. Then they’ll probably talk about your test results.
It’s very likely that you’ll be diagnosed with relapsing remitting MS. A large proportion of us are.
Assuming this is what the neurologist thinks, the next step will be to discuss DMDs (disease modifying drugs). So it might be useful for you to have some familiarity with the main ones in advance. Have a look at the decision tool on the MS Trust website: MS Decisions aid | MS Trust
You should also be given contact details of an MS nurse who deals with a lot of day to day issues. A good one is worth her weight in gold. That’s who you’ll probably find to be most useful when talking over DMDs and other symptom control drugs as well as referrals to for e.g. physiotherapists and other specialist services, depending on your needs. Hopefully you’ll get a good one who you get on with, chances are you’ll have a relationship that lasts for years. (Mine sadly died earlier this year from cancer, she’s still much missed.)
With regard to benefits, PIP is not awarded because people can’t work, it’s for care and mobility needs. You could be claiming Employment and Support Allowance (ESA) if you’re unable to work. But have a look at the CABs guides to benefits in the first place, that’ll give you some idea: Sick or disabled people and carers - Citizens Advice
When you see your neurologist, you should talk about the drugs you’ve already been prescribed. If Gabapentin is not working for you because of side effects, you should be able to swap to another drug that suits you. Maybe Pregabalin? Ask the neurologist you see in November. But in the meantime, if you already have access to another neurology service, see if you can get the prescription changed. A month is quite a long time to take something that makes you feel so bad.
It’s a pig of a disease, and you’ll find out more as time goes on. At the moment, everything is new to you, so you’ll find that everything seems difficult and unnerving. With this website (use the Everyday Living Forum too) if you have a question of a problem, just post on here and someone will try to help.