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Commonly seen with over dose of antidiabetic
drugs and insulin.
As your glucose level is 85mg/dl weakness and tremors are seen other condition also anxity state.
There are few drugs which may cause low blood glucose level if you take them common one Alcohol,salisylate and Beta blocker
You should test blood glucose in prolonged fasting state 14 to 16 hour fasting and 3.5 hour after meal.
If hypoglycemia is there are few other investigation like CT abdomen to see any tumour in pancreas?
Some times in early stages of diabetes
we see beta cell
dysfunction and episodes of hypoglycemia.
In the mean time continue to take regular meals at regular intervals.
Please take care
Good Luck to you.