Your feelings are normal and they are valid. Anger is often a big part of it, as well as sadness and hopelessness. I hope your sister is sharing this caregiving burden (while it may be a labor of love, it is also a burden) with you. You need time away to do things for yourself. This is a support group. You can vent, rant or express your feelings any way you want to. Guilt is not allowed. Do explore community resources for elderly and/or dementia patients. You cannot do this alone without getting burned out. Hugs 🤗🤗🤗