Each state has slightly different rules regarding Unemployment insurance. This is insurance that your employer paid for and there's a chance you are entitled to receive benefits (even if you received severance).
I am not an expert in the details of each states program, but I suggest you contact them as soon as possible to determine your eligibility and weekly payout amount.
You can find your state's unemployment website here:
It's important to note, in order to continue to receive the unemployment checks you will need to be (1) actively looking for work each week. and (2) contacting the unemployment agency to verify that you were able to work and looking for work.