What Are The Side Effects Of Zoloft?

Hi Dr...I have been ahaving numbness and tigleingness on the left side for sometime now, my md kept on telling me that i was have anxiety and that i needed to be on anxiety medication so i got on zoloft it did go away for a little while and now it come back stronger and now im feeling joint pain all over pain all over my body it is very very frustrating, i went to my neurologist and he said that i need to up my zoloft i did that and it has gotten worse...what could be wrong and what can i do about it..