I would second the other anon’s post about keeping in mind that you will not get any firm answers in first appointment, it is just first step, and the most likely outcome is that you will be referred for further tests. In all likelihood an MRI will be ordered; it is pretty much standard practice once someone has got to this stage. But the tests can take months to organise, and then there is more waiting for results and for follow-up appointments… it is a long-haul type situation.
Also, (and again, I don’t want to be a party-pooper) - it is really important to go in to the appointment as open-minded as possible. The fact that we are on this forum in the first place means we strongly suspect we might have MS. But for a lot of people, it turns out that MS is not the cause of their symptoms, and sometimes this can be very hard to accept - because if you feel completely convinced in yourself you do have MS, it can (oddly) be very difficult to come to terms when a specialist says this is not the case. Sometimes being told ‘not MS’ can make people feel as though their struggles / difficulties are not being taken seriously, and that can hurt, and can cause a lot of frustration and upset. But a ‘not MS’ diagnosis is not the end of the road… you just have to keep pushing until you find out what IS going on. I know this sounds like I’m stating the obvious, & I honestly don’t mean to - it’s just that we all need to prepare ourselves for the possibility that MS might not be the dignosis we end up getting.
And my last advice - whilst I have just said to try to be as open-minded as possible in hearing what the neuro has to say - at the same time, stand your ground if you need to. Most specialists are extremely professional, but some are maybe not so helpful. So if you feel like you are not being taken seriously, or if you are not being respected or afforded good care - then stand up for yourself and make yourself heard. If you do have MS - or any other condition - you need to know for sure, so that you can can get the right support and treatment. So this first appointment, whilst daunting, is a very necessary and important step, and you are definitely doing the right thing by seeking specialist support.
It is a daunting process, but remember the vast majority of neuros are extremely good at what they do, and that you will get there (wherever ‘there’ is!) in the end.