Having heart palpitations

I tapered off from 100 mg to 50 mg for a few weeks then went to 25 mg for a few days and stopped.
After stopping got hit with the worst derealization. Brain fog has been so bad. It’s been a week and some days now. The derealisation has calmed down but the brain fog has been on going and dealing with heart palpitations ands it’s almost been 2 weeks. Every time I fall asleep I wake up with my heart racing. Can anyone relate and how long till it goes away?