We cannot advise you to drop medication. Why not ask your dr ? Uk drs have an e-consult online option. Some countries seem to have an email option for their drs.
What I can say is 35mmol is a totally normal level. Many type 2 are not prescibed medication when only just over the diagnostic threshold of 48. Most drs are happy enough low 50’s and under however it’s achieved so long as you are working to reduce it as much as you can and maintain it. The Metformin has a small effect and stopping might cause a small rise, depending on what other changes you have made.