I have both my parents. Mom has dementia, Dad has mobility issues. I have called every agency, talked with my sisters about how overwhelmed I am and still nothing. I can't seem to get a break. I quit my job 4 months ago, because it was just too much. I feel all alone and have no idea where to turn next. I can't do this by myself anymore.
Having one elder to take care of is asking for a lot, but taking on TWO? You will be dead long before they are my dear. You really need to hire a maid to come in and do the laundry, cleaning, and maybe even the grocery shopping. It will take a huge load off of your shoulders. With the menial tasks out of the way, you will be free to do more with your Mom and Dad, AND have time to relax.
Let them know specifically what you need help with and then make a schedule. I, too was expected to care solely for Mom, (since I work for myself) but it was overwhelming for me too.
After getting a 'third party' involved, my two brothers (who lived locally) helped me every 8 months or so! (Save for a few visits here and there).
Call the Alzheimer's association 800.272.3900 and speak to a counselor. (I don't know how effective they will be for you, but they really helped me and listened to my problems.)
Post here, your most pressing concerns. Just communicating your problems with others that 'know what you are feeling' does help!
Look for resources on this website for help with respite. If your father was a vet, perhaps AID AND ATTENDANCE benefits will get you the help you need. It does take a while to get approved, but it will help you down the road.
http://www.veteranaid.org/eligibility.php
That website will help you determine what benefits COULD be there for your parents. God bless and stay strong.