Trust me, I know exactly what you're going through.
Do you know the numbers before you ate 15 carbs of breakfast? were they the same both times?
Also when you look at the vail with your test strips, it shows a "control range" with is basically the range of how accurate they are.
Mine is 109-146 right now. That means your tested number could be off up to 37 points.
I tried testing out of the same drop of blood with the same meter twice and the numbers where like 15 points off. Two different meters, and it was even worse.
Not trying to discourage you, or saying not to trust your numbers.
But I learned that the meter is nice, but I don't take the number for real all the time.
As far as the weight goes, I got a plan from my Diabetes educator where I ended up eating more then before I was diagnosed.
Gained like 12 points in the first 8 month. So I realized I had to do something, and tried to get my carb intake down. That has worked for me so far.
But again everybody is different, and it seems like you're not eating a lot of carbs anyways, so this might be no help at all...