Metoprolol lower dosage. Days and stop?

Hi Doctor, Gm. Need ur advice. I am 26 yrs/Male with no health issues as such. I was diagnosed with sinus tachycardia (heart rate in 140-150)/hypertension last month. (mainly due to work related stress/anxiety/improper lifestyle). Also have some GI/acidity issues. I have improved my lifestyle now (lost 5-6 Kgs weight), BP is in range of Systolic BP (120-130), Diastolic BP (75-85). My Echo, TMT, ECG reports are all normal. ECG few ectopics were there, doctor told its normal. At first I was on Ciplar LA 20 mg for around 3 weeks, it was working fine, stopped it as one day while visiting doc for GI issues, my DBP was around 100 (150/100). I was on Macsart Beta 40/25 mg for apprx 12 days. After which I was on Tazloc 20 mg/Embetta XR 25 mg for a 1 month. Now I am facing really bad side effects of metoprolol I am unable to sleep properly (hardly sleep 3-4 hrs a day) also feel lethargic and mild dizziness. Want to taper and stop it gradually. Can I take 12.5 mg for few days and stop?