I'm so sorry to hear about your mom - it's not heartless, you helped her by supporting her and the IRS will help you out for that.
Your mother is a "qualifying relative" since she lived with you for 1/2 the year, didn't provide more than 1/2 of her support and was disabled. Funeral and burial costs are not deductible unfortunately. This document lists it under the "not included" medical deductions (page 141):
http://www.irs.gov/pub/irs-pdf/p17.pdf
Are you single? Do you have other children. I ask, because if you are single, you can file head of household which provides tax benefits over filing single.





