Do i have the good foundation of a law suit against this woman? Are the basics of this issue better just left along? how can i start lawsuit procedure

I was hired a week after a grand opening. the exsisting maneger hireded me under no contract for a mutural agreed schedual. got along with all coworkers until that manager left.I didnt want the position. so Claudia, that wanted it so bad started giving weird attitudes.everyday for weeks. Not pleaseing either. she was so stressed out why she was givin management responsibilties with no pay.Claudia was in charge of the schedual. harrassed me every week claiming it was not fair to others of the days i was off, that i was not a fair team player and selfish for not complieing to those days.She finally got the position and started harrassing me in manipulative ways. and trying to get me to leave or fired. I had to leave. My body can not handle the stress. now I cant find a job to corispond the same schedual. and many more insadents i have no room here to explain.