Is being tired or fatigued a thought or circumstance?

So I have an autoimmune disorder that is proven by blood work results. On the days that I feel fatigued or low on energy is that a circumstance or thought?

When I feel tired it can get me down or discouraged.
Also on those days I do buffer meaning I watch TV, social media, read, day dream. Would that be considered buffering? I do those things because then at least I am doing something rather than going to bed or feeling about not having energy to do the things i wish i could be doing.