"Why didn't you tell me."
Because you are an ADULT.
"YOu never tell me anything."
Because your an ADULT who does not need to check in with another adult to change your drs surgery.
"I worry about you."
That is her decision. Or she could realise you are an ADULT and will make appropriate choices like not crossing road without looking first.
"YOu;re turning into your father (worse insult possible in her eyes)."
You are not your father, neither will you turn into him, its an impossibility. You are a unique individual and although you may have picked up various mannerisms/catchphrases/learnt behaviours from him...you still make your own decisions (as much as you can!) in life.
"I don't see why you needed to change - it's a good doctors, you don't know when you've got it good. "
Does she pause for breath here? You do not have to justify your decision to change. You are an adult, you decided. End of. (TIP: Never justify your decisions...you will go round in circles and she will do her best to tie you in knots. Just inform of decision, if neccessary, do not discuss further. I know its tempting to argue point tho...just keep in mind what will happen if you do try to justify your decision to someone who wants/is determined to change your mind)
"Well I don't know it's good do I (this is her argument for everything as me and dp's opinions count for nothing), I think the other one is fine."
In your mothers opinion it is fine. You also have experiences of the same drs surgery and they are equally as valid as your mother's opinion.
"Why don't you swop back and give it a better chance."
You have given the surgery 7 years of chances. How many more chances does it need
"I'll even sort it out for you. I'll pick up the forms tomorrow, I'm busy but I'll have to fit it in."
Helpful but no thanks. Busy, have to fit it in? Trying to be a martyr here? Do you want a cross and bonfire as well?
"You know when you need help"
This comment I can see leads you to believe that you cannot manage without your parents. Untrue!
"your dad and I aren't going to be able to travel that far."
Why would they need to?
"Well I supposed we will have to - won't we."
As in it is inevitable that you will fail to look after yourself let alone your son
"I mean it's not like I haven't got enough on my plate as it is."
Bring on the bonfire again...
"Honestly what would you do without me,"
Ie you cannot manage your life let alone manage your ds's life. Again you are incapable.
"you are lucky to have a parent like me."
"It's not like you ever say thank-you or show any gratitude."
Untrue statement from your experience. Which is as valid as your mothers
"like - you never said thank you then."
She should have said at the time.
Okay to shorten this prolonged emotional blackmail/verbal monologue...
"I changed dr's as I was not happy with my experiences at the other drs. I can see your upset/angry/worried but this will not alter my decision. I do not wish to discuss it any further."
If she comes back at you...
"did you hear what I just said?"
she comes back again
"what did I say?"
comes back
"I can see you don't like it, however I have finished discussing the matter, this conversation is going no where, so either we change topic or I will leave/put down phone/move to another continent."
Of course...the above is for the brave done it myself and it was scary...and mother did not like it one tiny bit...I was not expecting her verbally agressive out burst when I tried to tack and caved in slightly...be expecting it...
She will be frustrated if you don't play patsy anymore...
Hope you have got plans for house underway in some shape or form!