First of all, welcome to the forums - people here are truly helpful, and many are highly knowledgeable about the ways this condition can affect a person.
Just to clarify: RRMS means ‘Relapsing/Remitting MS’ and is the most common type of MS that people get initially diagnosed with.
A ‘relapse’ or ‘exacerbation’ or ‘attack’ causes varying symptoms to occur (eyesight issues, balance, fatigue etc.) and can last anywhere between an hour to several months. This is normally followed by a remission - either complete or perhaps 90% recovery - that can last anywhere between a few weeks to several years!!
(The term ‘remit’ is not an MS term - it’s to do with payment or an area of activity, so we should be using the term ‘remission’ instead !!)
SPMS - Secondary Progressive MS - affects many people who’ve had RRMS for 10 years or more. It underlines the ‘development’ of the condition to a far more constant form, where people no longer recover from symptoms - not even briefly.
PPMS - Primary Progressive MS - is the rarest form of the condition, where people continually deteriorate from the word go. Hopefully, this deterioration is in very slight steps, but there’s no relief from symptoms ever.
I’m certainly no expert, and not completely up-to-date with the newer findings being made by Neurologists all the time.
The above was the case when I was diagnosed 18 years ago, so there may well be others along to clarify my understanding and give a more recent explanation.
It may well be worth asking your Neuro to clarify the different types of MS, what they mean and how best to tackle your instance.
Remember, we’re all individuals and MS can affect us in a myriad of different ways - it’s often a unique instance for each person (e.g. there are medications that prove highly effective for some, but do absolutely nothing for others).