do i have a case against my former employer

i was told i was fired for texting on my phone and leaving my phone charger at work. my phone was in my car and i never took a phone charger to work. the boss was telling customers that i was ugly and that they would probably have another waitress the next night. he (the boss) has also called me vindictive and spitful. i was fired with really no reason that made any sense. i was not able to defend myself to the boss at all. i was told that a co worker was doing what i was accused of and i got the blame and was fired. the co worker just so happens to be the managers niece who is pregnant and she never gets in trouble for anything. i also had a problem with sexual harrassment by a customer and when i told the boss that i was goin to cops he told me i could lose my job. he did not say or do anything to the customer about the situation at that time or since then.they also had 4 employees on check and the rest get paid under the table. i am worried i wont find another job.