My Boss Gave Me Two Days Notice That I Would Be Going From Full Salary To Commission Only.

I’ve been on a salary for the past 8 months at my job and it seems the company can no longer afford me as I was given notice that in two days I will no longer be receiving salary pay. I will only get salary for the next two days and moving forward will be commission only. I have a written contract with my boss stating that I am on salary and he has not given me any written contract stating otherwise, yet refuses to pay me out for at least a little longer so that I can financially prepare. Any advice on this matter would be great, the pay at this job has already left me paycheck to paycheck and I will not be able to support myself without at least some preparation.

Edit: located in Texas, USA

Second edit: I did not realize my offer letter does not count as a contract. I do not have an original written contract