Yes, high dose steroids are serious drugs. And their side effects can be horrible. While you’re on them, you get the metallic taste in your mouth, teeth grinding, insomnia, extreme grumpiness (fury even). Post steroids you do tend to crash, along with a feeling of being punched all over.
The worst thing about steroids is their unpredictable nature. Sometimes they just don’t work. They are prescribed to reduce your immune reaction which is what causes a relapse. The steroids are intended to shorten the time the relapse takes to remit, or improve. But they aren’t a cure, and sometimes they simply don’t help.
It’s a very good sign that the steroids have reduced the symptoms of your relapse. It could be a sign that you are indeed RR rather than progressive. In which case, when you see the neurologist again, you could be prescribed some disease modifying drugs (DMDs). DMDs are only effective for the relapsing type of MS, their job is to reduce the number and severity of relapses, which of course you wouldn’t have if you did in fact have primary or secondary progressive MS. There is another subtype, that of progressive relapsing. DMDs could work for this type too.
Essentially, it seems your neurologist is waiting to see what happens for you over the next few months. If you do follow a pattern of relapses followed by remission, then he’ll be able to definitively diagnose RRMS and prescribe DMDs.
If however you were deemed to have PPMS, there is one DMD that is licensed (Ocrevus), but again, the neurologist will be adopting a watch and wait strategy.
Have a look at https://www.mstrust.org.uk/about-ms/ms-treatments/ms-decisions-aid That will guide you through the various DMDs, their potential benefits and their risk of side effects.
Best of luck.