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That is a big drop!
I'm not very good with someone who has insulin, but I would have thought that it would be the amount of insulin you have injected has caused this!
As I'm RH and too much Insulin in your blood causes hypos!
Someone will come along soon to help! Maybe @Robinredbreast can help!
But, if you are regularly having drops like that you will need to speak to your GP or nurse!
It can do in some people but in others it has the opposite effect.
You don't say which insulin you take but if your dropping low then you may need to adjust your insulin doses, do ask your diabetes team for further guidance.
I'm not trying to be rude, but you need to tell us EXACTLY what you ate. "A little snack" tells us nothing.
How many carbs did it have?
19 units of bolus (novorapid) insulin could certainly drop you that much and that fast if all you had was a meal of protein and fat.
To put it into perspective- if I took even 5 units of novorapid at once and without carbs....it would kill me. This is why we need to understand your situation better in order to help you with your concerns. This isn't a guessing game.
Yes, stress can absolutely affect your blood sugar levels, but each person is different.
It sounds to me that you perhaps had too much insulin for what you ate. Also I notice you mention only vegetable carbs with your meal. If you're like me they can be unpredictable on sugar levels. Eg. I can eat some roast vegetables and have a hypo an hour and a half later, other times I can have the same thing and have high sugar levels afterwards on exact same insulin dosage and portion size. I get a more stable result eating grain carbs with my meals. I think it has to do with the glycemic index of the carbs you're eating.... this is how quick your body absorbs the carbs. My dietician at the diabetes clinic recommended to me that mixing carb types with your meal should help prevent hypos afterwards. She told me this after I was on the low fodmap diet and I hypo'd a lot on that diet because it was mainly vegetable carbs I was eating. I was allowed rice but wasn't having that every meal. But needless to say my docs and dietician pulled me off it as I was getting crazy sugar levels. If you eat vegetable carbs in future it may be a good idea to drop your insulin dosage and see what you get. I get a mixed result and that's why personally I don't trust vegetable carbs. But everyone is different, so it is trial and error. Sorry to hear you had a big drop.