Irisgarden, I am just catching up on my reading today and read this and just had to offer you a big hug.
You know I say this with love in my heart, but it seems to me that you are taking care of everyone and nobody is grateful, nobody is giving back or offering anything to the home environment in any way, no wonder you feel alone...you are, even though they may be physically present.
You might feel less alone if you left and set yourself up in your own apartment. Forget your losses from the past, you can start again and you may find that loneliness has nothing to do with being alone, sometimes being alone is very empowering and a good place to find your peace and courage to move on.
I don't like to tell anyone what to do, and I don't mean to sound pushy that way with you. But it's just sad when those around you are so abusive emotionally and verbally, to see you remain in their presence.
Whatever you choose we all are walking with you. You ARE doing well, you have come a long way to get this far and you have strength you don't even know about to keep moving forward.
Hugs