Den, you "know" we care, or we wouldn't give you these ideas.
What you do with them is up to you.
You "are" in denial if you feel a milkshake is okay. Why do you tell us you're eating these. You know we're going to say something. If you want to be in denial, don't tell us you're eating milkshakes. Do whatever you want. Stick the those in your ears.
It's like you want to have us say something, and then get upset if we tell you not to do it.
When I was a little girl, around 11 years old, I took "3" buses by myself to get to a dentist(and back) in freezing cold weather. I would have tears in my eyes I was so cold. Now, I have "teeth". My brothers just didn't show up or go. One brother has dentures. The dentist would even yell at "me" about my brothers, but I just did it. My point is....if you really want to do something, you find ways to do it. I have a really bad sense of direction. My learning difficulties get me in so much trouble, as I get confused very easily. People laugh sometimes. It's hard, because I know I'm smart. I've learned to try to not let it bother me. Most of my friends are understanding of my confusion with time and directions. I reverse the numbers, write down the wrong thing, etc. I have to look over the numbers a few times, clarify with friends the day before, etc. to make sure I get to the right place at the right times. I make sticky notes. It doesn't stop me from doing what I need to do.
If you don't go to the doctor, and it was getting worse, you couldn't work, which would not allow you to get a salary. You know your body. You do what's right for you. If you take your bs numbers two hours after the milkshake, you would know your numbers. That might help. If they're 200 or 300, you've made the wrong choice.
Are there any health facilities closer? Next time you're there, ask about support services, volunteer rides, etc. Maybe there can be some support for you in situations when you need to see a doctor. Don't just give up and say, I can't get a ride. Have a friend call around for you if this is too much. Talk to your therapist about this or support group. Don't just give in.