C.O.
J. - you need a lawyer...
I'm sorry this is happening..it's got to be tough. Find out what the courts found as valid evidence to take your son away from you....then work to see if you can rectify the situation and get your son back - basically what hoops do the courts want you to jump through to get him back.
Seek help through a lawyer, a womans shelter - they might be able to direct you to places who can help you since you no longer have a home, job, etc.
Also contact the Alzheimers Society (if this is what your mother has) and fight out what help you can get from them not only to care for your mother but to get your life back as well as your son!!
Good luck! God Bless!!