I wonder how many type 1s your doctor has on his books. It might help to get a referral to a hospital specialist or at least to ask to speak to a diabetes specialist nurse.
I think that what you're experiencing is very common. So common indeed that it has a 'name' and there is even a book about it (Diabetes Burnout... its American and I haven't read it though it gets good reviews on US Amazon.) If you google Diabetes Burnout you'll also find lots of mentions.
It's common for a lot of reasons including these
The time and attention required to manage type 1 .You can't put it on the backburner and forget it for a day.If you do, you then feel guilt, so you ignore it for a bit and then feel even more guilty. It's sometimes difficult to break the cycle.
Sometimes focusing on 'perfect control' can cause it, especially if you are doing 'everything right and it just doesn't work. Type 1 isn't always easy. Even if you can achieve it the micromanaging necessary can get too much. (sometimeds reading forums like this can make this one worse
)
Sometimes, pressure from your family and others (the doctor?) and sometimes comments from the 'diabetes police' can just get too much.
You've done one thing that can help, contacting a support group of people that face the same problems but I think that Its also good to meet other type 1s, are there any support groups in your area?
(you could contact Diabetes UK, the charity, not this site)
A Dafne type course is an excellent suggestion. It might help you control of your diabetes and hence your life. Following its ideas help you to live a very flexible lifestyle. There is a sort of online version which might be of, help partiuclarly if you haven't come across the ideas of dose adjustment before.
http://www.bdec-e-learning.com/ (but I think being with others is important)
Good luck,
I'm sure just 'talking' about it may help.