So guys, in Series 5, Thomas appears to be suffering from some sort of illness. Do we think Thomas is either:
a) attending some sort of course that provides medical quackery for "curing" his homosexuality, and it's making him ill?
b) OR he's actually a diabetic, and attempting (not so well) to self-medicate with the syringes (perhaps containing insulin?) we glimpsed when Baxter pushed her way into his room in episode 4? Diabetes was flagged earlier this series, when Isobel was seen talking to Dr Clarkson about the new treatments available - seemed to be a bit random, and I reckon it was to foreshadow an upcoming plot point.
c) something else....?