I agree with Kybert- I would get rechecked on the diabetes, too. I had stayed on the low side of my regular weight for a while (my BMI usually is around 23 too) and then lost 4 more lbs trying to control my b/s with diet until I got my meds.
My fasting blood sugar was fine- usually around 90- 100. My 2 hour was high, but my 3 hour was right where it should be before meals without my meds. So, not a bad case, but still, it has impacted my weight and how I feel.
Now, 2 weeks after getting my diabetes meds, I have gained 4 lbs back already! I feel a lot better and a lot less tired now <img src="i/expressions/face-icon-small-smile.gif" border="0"> ).
I am taking a pill called Prandin a half an hour before meals. I may have to up the dose for morning (we are giving it a month to check my numbers <img src="i/expressions/face-icon-small-wink.gif" border="0"> ), but the rest of the meals and the day are fine, though I do have low b/s if I forget to eat a snack in the afternoon (when I am most active).
I hope you do get it sorted out soon! It's good to be proactive, but I would sort everything else out first that could be causing your problems <img src="i/expressions/face-icon-small-wink.gif" border="0"> .