i'm not laughing right

i started zoloft about 3 days ago 50 mg. ive been getting this restless jittery feeling, and this anxiety/butterfly feeling in my stomach. i can't fully yawn or stretch, everytime i think something is funny i can't laugh right. like i can make a noise but i don't get the dopamine rush or whatever it is with it. i also woke up in the night with this weird vision and felt dizzy. it went away, it only happened when i would wake up in the night. should i just continue taking it and see if things start going away, lower my dosage to 25, or stop? im taking this for depression and anxiety