Can anyone tell me why when my son has the same thing to eat everyday and injects the same how his levels can change? At the moment he is having his dinner, his levels were at 9 when he injected and as he is eating his levels are dropping quickly! Is this normal?
Yes, this is life, it's never exactly the same, though it tends to be generally similar from day to day for identical conditions once you eliminate any confounding variables as listed above re stress/sleep/caffeine/exercise/etc. It is hard (impossible) to eliminate them all though, so it's often best to simply not expect it to be the same, and when it is you pat yourself on the back and buy a lottery ticket
😉
It does also change over longer periods irrespective, so any given response today will likely be different to that in a month or two, even once you've accounted for as many of the variables as possible.
Variety is the spice of life they say
😉
He feels more comfortable when his BG levels are at about 10/11 so when they drop under that he starts to panic and not feel good. He says he feels terrible like something is seriously wrong!
This is his body having adjusted to the higher levels. It will go away once he starts running at normal levels.
I don't know how to deal with the anxiety aspect, aside from him experimenting to see how much a given dose of insulin will (typically) drop his levels and how he can raise his BG with something fast acting (dextrose or sucrose for example will be almost immediate and can be absorbed in the mouth through the cheeks.)
I say typically above, because sometimes I inject a correction only to find that my BG has independently decided to head down (vertically!) on its own - that can be mildly concerning, however knowing how much and quickly you can raise it is a good reassurance that you can get yourself out of trouble.
