Just adding "Low blood sugar (hypoglycemia) can happen to everyone who has diabetes. Symptoms include headache, hunger, sweating, irritability, dizziness, nausea, fast heart rate, and feeling anxious or shaky. To quickly treat low blood sugar, always keep a fast-acting source of sugar with you such as fruit juice, hard candy, crackers, raisins, or non-diet soda.".
So you may have been experiencing a real or false hypo.
I tend to work in the older units; just done some converting.
https://www.diabetes.co.uk/blood-sugar-converter.html
You say that you were testing at 200 after a meal. This equates to 11.1 which is far too high. Your original 300 equates to 16.7 which is verging on the dangerous. Getting down from 300 to 200 may be an improvement but it isn't good or safe.
67 is 3.7 in "old money" and is definitely a hypo.
91 is 5.1 which is pretty near ideal.
128 is 7.1 which is getting high(ish) but is far better than your previous readings.
139 is up to 7.7 - still high(ish) but in the target area for reasonable control and far, far better than your previous results.
Remember that we are just enthusiasts here, not medical professionals.
However the figures that you have reported indicate that you have been having hypos. This suggests that the Sitagliptin is being a little too effective and you might need a smaller dose.
You haven't given a lot of information; I assume that you are taking the pills at the same time as food so that the increase insulin production has something to work on.
Some idea of useful test times for helpful results:
Immediately on waking (fasting reading)
Immediately before a meal.
One hour after the meal
Two hours after the meal
Immediately before bed. This can be related to your fasting reading to see what your BG is doing over night.
Two messages, then.
- It looks as though your medical team was quite right to put you on Janumet. The BG readings you have reported to us are far too high even after taking Metformin.
- You appear to be suffering real (not false) hypos. You need to sort this out. Either your dosage is too high or you are taking the pills at the wrong time. Or both. Talk to your surgery NOW!