I know about taxes...
If your only income is UNearned income, such as SSI, then, no, you can't claim Earned Income Tax it. If you're married and your spouse has earned income but you don't, then, yes, your spouse (and you, as a joint filer) could claim EITC, providing your income is in the right bracket.
Keep records of all of your medical related expenses, as these may be deductible, if you itemize your deductions. This would include (but isn'tlimited to) all copayments and medical bills unreimbursed by your health insurance, your health insurance premiums, mileage to and from doctors offices and other treatments, and lodging-- if needed to obtain medical care, costs and meals for health aids at home if appropriate, any changes to the home (such as air conditioner in bedroom) if a doctor feels is necessary, as well as medical supplies deemed necessary by the doctor. The list is pretty long, and I'm happy to give guidance if needed.
Also, if you need any special equipment in order to work, this is also deductible, though not limited to the medical limitation.
you can go to www.irs.gov for further information.
hope this helped.