Ive Been On Prozac For Almost A Year And It

ive been on Prozac for almost a year and it doesn't seem to help, my doctor added a small amount of abilify so I took it for 14 days and quit because ive been feeling worse anxiety and depression and gaining weight too fast, this is the third day I haven't taken the abilify but im still taking my Prozac like normal. I feel dizzy since I quit the abilify and tired and anxious and panicky. why after only taking it for two weeks and how long will this last? it was only 5mg