Hello people.
First at all, english isn't my first language. There's might be mistakes and sentences that make no sense. I apologize in advance.
The message will also be pretty graphic for context.

So, I am 29 years old and I will start soon therapy. My general doctor diagnosed the phobic disorder and the anorexia, and gave me a few psychiatrists numbers that I will call on monday.
The issue is that I don't drive, so I'll need to tell my family that I go to therapy, and why. I don't want to lie and find excuses anymore.
I always feared vomiting, but it became a phobia when I was 10 and my upper lip was bitten off by a dog.

The very tricky part is that the dog was family dog and I know that my aunt, my mother, my grandmother and two of my cousins still feel guilty about the incident. I don't want them to also feel guilty about the emetophobia and the anorexia.

So How can I tell them all of it without hurting them more than they already hurt ?

Also, I know they will ask how they could help me. And I don't know the answer to this question. My first instinct is to ask them coddle me about it, but I know it won't help me in the long run.

Thank you for reading,
M.