I've been having a lot of different symptoms the last few years and have been to a variety of specialists with no help so far:
Chills - (mostly running down the left side of the body from head to toes).
Sensitivity to cold/heat
Sensitivity to bright light
Hot flashes - (Seem to usually...
Chronic low iron saturation can cause iron deficency anemia.
Chronic illness of any kind can cause anemia, in fact it's called the "Anemia of Chronic Illness". Looks like you were just starting down that road, it's good they caught it early.
I think the first two episodes were more scripted, but the second two did allow for some improvisation. Personally, I like the naturalism which that allows. I adored the scenes between Shaun and Smell for that reason.