Im been taking 100mg of zoloft for 3 months now. I've winged myself down to 12.5mg by splitting the pills. I want to get off of it, but when i don't take it for 1 day, i feel very weak to where i have to sit, very tired, and lightheaded. I don't know what else to do. Should i go down to 6.5 mg to 3.5?