Paperwork is your friend in this case. When you apply to see a doctor, do you do so via telephone or email? The latter would be the better option as that way you can keep a printed record when the surgery says "sorry, your doctor is in another castle". That way when people ask "what are you doing about it, you can present them with documented proof that you have been searching for a doctor, albeit unsuccessfully.
Physics is fun and now that you're happier, you have a much better chance of being successful with your course. It's nice to see a positive ending in here once in a while - let's hope for other folks to a get a happy end as well.