I am on 200mg of Zoloft. I started it last January, and have slow...

I am on 200mg of Zoloft. I started it last January, and have slowly increased my dosage to find the correct dosage. I am starting to feel anxiety again, and feel as though your body gets used to the meds, and you continually need a higher dosage. I am jittery, have insomnia, have very vivid dreams, tremors, my eyes tremor when I try to close them and I see flashes of light, when I nod my head down towards my chest it tremors, i am restless, it has made my add worse, it causes slight weight gain, muscle twitching...it worked fine, but the higher the dose, the worse the side effects, and here I am with anxiety again. I suppose I need to switch my meds - maybe try lexapro. But definitely get a new psychiatrist.