Talk to General Physician on Shaking After Taking Meds

Assalamualaikum. I am here to ask about my father's shaking condition which he faces after taking meds for about 5-10 mins. He was diagnosed diabetic 2-3 years back. He had quite controlled it with regularly taking meds, diet control ,healthy foods and regular walking. He still has a prescription of tablet Getryl 1mg. Recently he has started taking calcium supplements to recover from calcium deficiency. He takes getryl 1mg and calcium supplements together early in the morning . And a week or two ago he has started feeling shaking feeling in his body after taking the meds. Is it because of taking the two meds together ? or is their any other reason. We have been asking him to get his blood sugar level checked. But where he is.. every lab is conducting Covid19 tests. So he can't go to nearby lab to get his blood sugar level checked.