Could Severe Anxiety And Shaking Be The Side Effects Of Zoloft?

Hello..I have been on zoloft for about 10 years...started on 25 mg then up to 50 for years, last fall had a relapse and dr increased my dose to 100. Felt fine, normal, amazing...after several months of feeling good he backed me down to the 50 again, anxiety came back. Now whe we went back to the 100 I have horrible side effects and am more anxious and shaky than ever. what is going on?