It may be your blood sugar normalizing. I have diabetes and the first couple of weeks after removing sugar, potatoes, rice, etc from my diet it would feel like I had low blood sugar but my meter was running normal. Normal felt like a low because I had been running high. Thankfully my doctor warned me about it so that I could test when I felt like that.
Walmart has a blood sugar meter that is inexpensive as are the strips. I test my blood sugar 2 hours after adding new foods into my diet.
Lisa I've had episodes like this too and for me the amount of calories I ate didn't effect my blood sugar it would be if I overdid it on carbs. I'm not sure what kind of foods you eat but I limit pastas, breads, and sugars to a great degree. If I eat too many carbs I crash, get the shakes, sweaty, etc. and normally consume a Tbsp of Peanut Butter to bring it back to a normal range. LOL I don't know how many other people use PB but it works for me in those cases!
Thanks for the responses, maybe I need to be making better food choices.
I do try to the limit the carbs, but let me cut them out a bit more and see if that makes a difference.