Should I stop it?

Hi! I started taking effexor because I had emotional dysregulation and had frequent depressive episodes. My last episode was 2 months ago. I gained 13 kgs and I can't sleep more than 2 hours because of it, however I managed to take it regularly. Everything was fine until 2 weeks ago. I have extreme dizziness as if I have brain damage. Now I can't go to school, I can't even stand up. I'm so tired because of this nausea. What should I do? Shohld I stop it immediately and deal with the withdrawal symptoms?