[Nods and thiiiinking. I wish I could remember more of my nurse training, it would help SO MUCH.]
If it's just exhaustion, then at least it's not a dire sign. Possibly the worst case your body is working harder, so it's wearing you out more. [And hopefully that is the only option at this stage for worst case.] Best case, it's just your body trying to catch up from the revival and hasn't been able to because of everything else happening, the stress alone would make it hard.