SSDI is the one that goes by quarters of time you have worked during your lifetime. It is based on disability and amount of time worked. I believe you need 60 quarters of full time work (which amounts to approx. 5 years)
SSI is needs based . You can only receive that if your income is ridiculously low. Once you apply for one or both, you will most likely be denied. Be prepared to appeal immediately. and KEEP appealing (unless you don't have the work quarters or lack of finances. They look at all you own, bank accounts, more than one car, anything of value.
Can you get an ombudsman through social security to help you through the process? Or a disability lawyer (who doesn't collect a penny unless you're approved)
Feel free to message me as I was in the same situation. I was totally intimidated by the process and ready to quit before I began.
I'm willing to help with anything I can.
Cali