(((Angel)))
I can imagine that this is difficult for you indeed if you believe you have Lupus and have not had this diagnosis confirmed and it makes it harder for you when you are questioned by your gran and this enrages you.
You said you could really just use a

in your post so here you are:
((((angel)))).
I hope that you are able to work through these emotions.
It can't feel very comfortable feeling like this all the time.