Metformin side effects. It will persist?

I am 32 years old..and working from Home..recently got to know am diabetics and taking medicines for the past 3 months...very first time PP sugar level 238..1 month back 126 PP.... 2 weeks ago I checked average sugar HBA1C it says 6.4...am taking same medicines below from start till now... Morning Glimestar M1 (metformin + glimepiride) Night Melmet 500 (metformin half) Last few weeks I am feeling kind of low sugar symtoms like dizzyness, headache and feeling tired...Is this related to the medicines... I stopped glimepiride 2 weeks ago and taking Metformin 500 mg in night, Dapagliflozin 5mg in the morning but still i am feeling weekness...blurred vision sometimes..Is Metformin also has some side affects....like feeeling uneasy. And giddiness lightly.or still am feeling glimepiride sideeffects how long it will persist? Note : I volunteerly checked my sugar 3 months back...life before that was far better than now...