Hi I Had Been Prescribed With Janumet 50/500 Twice A

Hi
I had been prescribed with janumet 50/500 twice a day after meals,as my sugar levels kept varying : 140 fasting and 180 2 hrs after meals, doctor advised me to take 1/2 mg glyree before breakfast. On taking glyree I found that my sugar level falls to 90 2hrs after meals and remains within 125 rest of the day. At present I am taking januvia 100mg instead of janumet to avoid stomach problems. My fasting sugar is still 150. Can you please advise me if I still need to take januvia as I am taking glyree? Please advise the best combination
Regards
Madhuchanda