Gas / Burping problems?

Hello, first time posting here. Been diagnosed of diabetes since 6 months ago (recent blood test blood glucose 110 mg/dl, A1c: 6.6 % ) and i've been taking metformin xr from my GP.

Ive been noticing that im burping a lot, stomach / upper chest area may sometime feels tight / full, and occasionally having a choking feel on my throat.

Is this one of the side effect of metformin? excessive burping causes my shoulder sore for a while :(

EDIT: Also general tiredness that ive felt all day long