If you are working in cash do not approach the police as they will want yr work insurance to file any monetary damage, just tell the hospital you were helping yr uncle , If you are wanting a U visa tell them you want a U visa directly , don’t hint them indirectly , see a psycaitrist and record yr problems after the incident , but it all comes to the immigration officer asking for IRS tax file information , if you were working in cash than you ll be in a hell lot of problem trying to approach immigration benifits in this case.