Am I as in home caregiver subject to self employment taxes while providing care for a parent who is totally disabled and bed ridden?

Actually depends on the situation. If you are a live in then you are definitely an employee and employer should be withholding taxes, etc for you.

The family may not be paying you legally. Is there a care agreement? Sometimes families will pay someone cash, under the table, which save money. Paying you $12.00 an hour or whatever beats the heck out of $30.00 charged by a legit care company.

I suggest you consult with an elder law attorney to discuss how to properly set up a caregiver agreement so that any compensation you receive will not cause future problems with your mother's estate of with medicaid eligibility.