I'm not surprised you're tired. I started on my pump 7 weeks ago and got extremely tired, even when I was sleeping through the night. My readings weren't far off target so it wasn't that. Just learning to use the pump, the extra testing, fasting, what to do, how to wear it and the focus being on it all the time. My memory suffered, I'd promise to do something and set off to do it, but only realise days later (when I saw my note) that I'd totally forgotten. Managed to carry on working, but outside work I was away with the fairies :roll:
Add to that the fact it's on your small child and it's no wonder you're exhausted.
After 4 weeks the DSN told me to 'take a step back' and do normal things like eat what I would normally rather than fixed carbs/fixed times, have a lie in etc. There's still some tweaking to do, but this mental relaxation made a big difference. Then I started to see the benefits of the pump rather than the extra hassle.
Hang in there, it will get easier!