Hi Alicia
A few years ago I was in a similar position. I was testing my sugars and perhaps wasn't depressed but was struggling with control which allowed my mood to swing a fair bit. Type 1 as well.
My story is that this forum helped me.
I'd seen people keep saying how lowering carbs could help immeasurably, so after a while of ignoring this (and generally being jealous of them), I gave in and decided to give it a try.
I reduced my carbs down (gradually at first) and spent a lot more time than I had been doing tests and recording the numbers.
I decided to give things a month. The first week went great, then the second week went a bit dodgy again, but by the end of the month I was a changed person and felt in control for the first in well over a decade. I've not looked back.
Ed