Metoprolol Withdrawal Symptoms. 110 bpm.

Hello Doc, I felt some side effects with minoxidil like heart palpitation, headache. So I stopped taking that. My ECG report was 99 bpm and doc claimed it to be sinus tachycardia. In order to counter the heart  palpitation my doc prescribed me beta blocker METOPROLOL 25 mg.12.5 mg in morning and 12.5 mg at night for 1 month. But side effects are coming into play of this medicine like so much dehydration, dry mouth, thirst,urge to vomit, loss of appetite. I can't sleep properly in night. Even if I sleep I'm usually woking up around 5.30 am to drink plenty of water to hydrate my body. Now I have completely stopped the medicine on 2nd april but now I'm getting additional side effects like heart palpitations, anxiety, stress, urge to vomit, still dehydration, thirst, loss of appetite. I talked to my cardiologist and he is not listening to my concerns and completely ruling it out. I can't concentrate, think, eat and sleep properly. Standing heart rate is over 110 bpm.