DT,The side effects may be harsh but more likely will ease up the longer you stay on Zoloft and eventually disappear.
Lexapro and Zoloft are both SSRIs and have the same side effect profiles, though any individual might have some side effects to one that they didn't have to the other. Most discomfort people experience in switching from one SSRI to another is due to discontinuation from the first med, if the second one isn't at a sufficient level to avoid those discontinuation effects. Give it 3-4 weeks.
If you find the side effect intolerable do contact your Dr.
Kindly,
Kitt