Zoloft and euphoric

Have been on 50mg Zoloft for ~3months. At first, I felt euphoric and happy, no appetite, calmness exuded throughout my soul, but about 6 weeks ago I began to feel anxiety again. I started to obsessively bite/peel all my nails off, which I've never done. My hunger for food, especially sweets is endless and I have gained 6 pounds so far. Also, I feel completely lost and can't function with my daily activities without feeling a constant loss-of-focus feeling. I have memory loss and feel insecure. I don't want to go on a higher dose for fear I may feel worse in the long run, so I have decided on my own that I will very slowly wean myself off this drug (12mg at a time until I am done to zero mg). Maybe I will feel better than I did before I took Zoloft, but I don't yet know what the outcome will be. If anyone has felt better after taking Zoloft and weaned off of it, could you e-mail me some input?