Hey Cheyenne,
Unfortunately, fatigue is very common issue for pwMS day to day basis as well as during relapses but there are a plethora of other causes of fatigue and because you already have a dx of sleep apnea and have consciously been loosing weight (well done btw), you've got two potential explanations already.
Most of the more common causes (eg vitamin deficiency - Iron, vit B, diabetes, hypoglycaemia, infections etc etc) can easily be exclude with basic blood tests, and i think it would be a good idea to see your family doctor to get it check out, 'just in case' there is something amiss that you can tweek to get back to normal.
Cheers..........JJ
Thanks JJ.... ya I just had a plethora of blood work and all is well... but I am just trying to muddle through...
Thanks for you kind and educated reply:)