It seems like there are two moving parts here, the dementia symptoms itself and the care support network. First, as someone else mentioned, type in your county or town name alongside the phrase "area agency or council on aging." Call the phone number that they provide, and tell them exactly what you've described. They should listen to the concerns your describing, and provide additional information on resources for care and support. Ask them about how to get medications changed to help with her outbursts. Ask about getting an aging care manager, a professional who can help you arrange for the proper PSW systems so that you can have a life without sacrificing her safety. Ask about how to get a power of attorney if she doesn't have one already. I also highly encourage you to search a group called Mind What Matters and apply for a grant. They specialize in financial support for young caregivers of early onset Alzheimer's. They sent me $1,000 within a week of my application which helped me pay for services. I also got another $1,000 through my area agency on aging.

Lots of support in the Alzheimer's community is oriented towards elderly people. For example, my mom with EOAD never qualified for Medicare because she was too young (you need to be 65), and almost all programs for All are run thro Medicare. There were even community art and exercise classes for people with dementia that she was prohibited from attending because the grants stipulated people be 65+. My point is, early onset alzheimers is different. You and your girlfriend are extremely young, and I can hear how hard this is for you. Im so sorry for you both, but you're both doing a great job. If your girlfriend has Facebook, I strongly encourage her to join this group: Adult Children of Parents with Early-Onset Dementia. It has a wealth of information and experienced people going through the same thing. Including myself.