Not hungry, High BG

Due to other health issues I never feel empty, if I go a day without food at some point the next day I might feel hungry but as soon as I eat even a spoonful I feel full. I drink between 2/3 litres of water per day.
I haven't eaten for 3 days and I don't feel empty or hungry.
BG had been between 8 and 10 I have taken two doses of 2 units of insulin per day.
I don't feel yuck but there is some kind of problem, dry mouth, dry eyes, itchy (problem these are some of the side affects of meds I take) .
Do you think warm weather is causing problem or at least contributory

@Galja Yes, showing on meter as low
Still feeling the same, I had a mini babybel last night, I feel really full.
BG is hanging round 8.
I think I might have some sort of infection, mega pain on Friday, very bad muscles spasms, sweating buckets, false hypos. Calling GP tomorrow if today doesn't go well

last night in bed I felt like I was burning up, in pain generally not good, dog knows what time I fell asleep, woke up feeling great and I've had a yogurt for breakfast.