If, as lbouchard indicates, you are eligible for benefits through the US SSA system, even if you've not worked enough to receive SSDI, you may still be able to receive SSI. I know also that as long as you are here legally and have been here more than 5 years, you are entitled to benefits from DHS (food stamps, medicaid, etc.) based on your need.
And yes, non-matriculated basically means you take one or two classes at a time, which should help with your stress/anxiety levels, most schools do have a limit however on the number of credits you can obtain this way.
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