Withdrawal symptoms are torture

I've been on zoloft since I was 17, I am 21 now. It's caused uncontrollable weight gain, especially this last year. I've been on 200mg for about a year now. But I'm ready to go off it. I miss my old body. I'm tapering off carefully (100mg for a week, now 50mg). However, the withdrawal symptoms are horrible. I'm so nauseous, can't sleep, and emotional. Anyone who has experienced this, how long does this last? 🤮😣