Another let down

We finally thought this was it. I stopped my anti-depressants. My cycle was normal, no more periods disappearing for 2-4 months. I have been nauseous for awhile. I have been puking all day for the last few days. I've been emotional and so tired. Cramping. My mouth has been watery. No period for 3 weeks. I'm so sad. I'm done trying. It's getting really depressing.