Having an annoying even destructive relative in your life can take its toll on us. You have every right to your feelings on such matters.
You seem to be dwelling on issues also. I know what that is like and it wears you down.
Ok, let's talk about anxiety. The following threads may help. Just use search or google each of them and read the first post.
BeyondblueTopic anxiety, how I eliminated it
Beyondblue Topic who cries over spilt milk?
Beyondblue Topic fortress of survival
Beyondblue Topic fortress of survival part 2
Beyondblue Topic nip it in the bud- ideas
Beyondblue Topic seeking the origin of anxiety
Beyondblue Topic Meltdown back to basics
Maharaji Prem Rawat youtube sunset
I hope they help.