File for unemployment. Sometimes the employer will not oppose. If you don't get it the first time, you can ask for a hearing before an administrative law judge, usually.
I don't practice law in your state but you can probably get a free consultation from someone local. Try National Employment Lawyers Association for a referral.
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Appeal the unemployment decision. Make sure you do it before the deadline. Then request a copy of your personnel file from your former employer and get a copy of your file at unemployment. You should seriously considering hiring an local employment attorney to represent you at the hearing. Workers who have representation generally have more success than those who do not, and the cost for the hearing should be reasonable. You can search for an attorney on Avvo or contact the National Employment Lawyers Association for a referral.
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