Fatigue in PPMS; your thoughts please;

Hi. To date I’ve been quite fortunate with fatigue, and have only really felt knackered if I’ve drunk too much wine the night before, have a cold, overdone it at the gym etc. But now, I often have long stretches where I just feel totally exhausted for no apparent reason, the sort of tiredness you get when you’re desperate to go to bed. Am just curious as to whether any of you guys suddenly developed fatigue like this, or whether it’s been a more constant/steady symptom? Would appreciate any advice, as am not used to this. Cheers, Pigeon.