Feeling drained after taking lantus and metaformin – is this normal?

feeling-drainedhi i have a question, my doctor has put me on lantus and metaformin and i took my first shot last night, i woke up around 6 this morning and my bs was 170 and then took my metaformin and went back to sleep and now my bs is 95, i fell so drained and im not sure if this normal or if its just going to take some time to get use to this, can anyone tell me if this is normal?

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