I have to say, a lot of it is probably due to the bastard swine Flu. Me and the DC's all had it in July, and since then, even DS1, who has the constitution of an ox, has been ill almost constantly. My GP says that even in someone with no additional health probs, SF can depress your immune system for at least 9 months. For someone with epilepsy (like me & DD) the constant cold after cold after cold is lowering our seizure thresholds. Dangerously in my count, as there's no more meds they can put me on, short of Keppra (on top of my Gaba).
The Keto is a bastard, as you can't have any fruit, and the huge amounts of dairy (IME, from my friend's DD who has LGS) does increase mucous production. It's the whole balance of side effects thing that runs through trying to deal with epilepsy though, isn't it? All dairy with Keto=increased mucous (horrid when with a cold), Too much meds=eveil side effects (in my case). (((HUGS))
Have you tried lifting one end of the bed? we have DS2's head end propped up with cookery books. Hope you feel better soon.