Speaking from my own experience, what Alison says is very true.
I ignored my symptoms for years - not because I was doing an ostrich impression, but because (unlike yourself) I accepted what I’d been told (that there was nothing serious the matter), and MS never crossed my mind for a minute (maybe occasionally for a second - but I immediately told myself: “Don’t be so silly!”).
So I struggled on with quite low-level symptoms for years, assuming this was how everybody felt past 30, 35, 40 etc, and I was just making heavier weather than most.
Eventually, something rather more dramatic happened (woke up one morning with complete loss of sensation in both feet, and reduced sensation in pelvic area). Diagnosed relatively quickly after that - though it still took another eight months (it’s a b*gger to diagnose).
I know it wasn’t the ideal path to diagnosis, but it was certainly a case of: “the truth will out”, and as soon as there was something more drastic to go on, everything fell into place quite quickly.