Welcome Benz
It does appear that a lot of people here have never had any forewarning before something dramatic has happened but Plasma Cell Dyscrasias or Monoclonal Gammopathies (I'm no expert) can be very varied in their symptoms and effects.
I'm different (and flippant) and have a multitude of symptoms, but nothing critical, which sort of make me an equivalent to a white or yellow belt if you think in karate terms. I am categorised as MGUS which can be nothing or represent the run up to one of the family of Myeloma illnesses.
I have recorded my stats elsewhere here and from what I have read they put me at increased risk of progression, but my symptoms may suggest something else is at work. My FLC score of 131 may seem high at five times normal but someone here mentioned a score of 31,000.
Without significant symptoms it's usually a waiting game to see how your scores progress, which is sensible, even if it is frustrating and worrying. I take the view that I don't want to feel worse than I do already with unnecessary treatment.