Hi Mann,
You have committed two big mistakes.
1. 'Honesty' about your sick mother. Your mother can only fall sick after you get your GC. Any Govt has fear of public charge.
2. 'Offering to work'. People take affront if you tell them they are 'Slow' (However goddamn Slow a***s they are!).
People want you not to be 'QUIET' (That makes them feel 'Neglected'). They want you to keep telling your sorry story (That makes them feel in control 'they can change your misery') and requesting their help (That makes them feel 'Important').
I feel a lot like you, but you have to 'Be Diplomatic in Public' and 'S***w them in Private'. They do it everywhere, but it is more in the 'Cut-throat world'.
You have to be like the 'Apprentice' and the 'Survivor' (CLAP, CLAP!). You don't have to have GOOD qualities, you have to be SAVVY(sic).
Intelligent people die early, Smart people rule the world. Smart in the USA means ('The one who is able to go laughing to the bank - eventually').
Don't do any protest or anything (you might be jailed, and put everything in jeopardy), Nor try anymore offers to work for anyone.
You may personally try to meet, with a SORRY face, and wish them well. And congratulate them on the GREAT(sic) work they have been doing lately. Maybe it will work.
If that does not work, File a writ of mandamus - Hire a good lawyer(good not= cheap), and pray for a sympathetic judge. Your case could be a 'let us teach him a lesson' type.
Sorry Man, Forgive me if you felt offended. (Everyone has a right to feel OFFENDED, and play the victim (Just who is the VICTIM? don't ask.)
ps: I hate to be SAVVY(I am NOT!), but I heard it is very lonely in Heaven.
Kindly be Good to some really Good people out there.