Need Encouragment/Support Pls

Ugh. Ladies. I'm in such a negative head space right now. I've struggled with sugar addiction since I was 4. (Abuse/trauma triggered food issues from that age). I had a late diagnosis with GD, with my current pregnancy. I'm currently 36+3, and was diagnosed at 32 weeks. Started insulin at 34 weeks. I was doing SO good. Very very strict, but manageable, diet wise. All of my numbers were great, without insulin, except for my fasted number. I had made the choice to cut out grains when I realized that even the healthy, complex carbs were spiking my sugars. My medical team gave me a proverbial "knuckle rapping" for cutting out grain, and insisted I put it back in and just take fast acting insulin before every meal. So frustrating. So now, the cravings I had managed to get rid of after I cut out grains, are all coming back. I want the doughnuts, the ice cream, the junk carbs. And the past 3 days, I've basically failed miserably. I don't know how to get back on track, successfully. And I just have such a defeated feeling and attitude. I'm so upset with myself, and just feel like giving up. I don't even know what I'm asking for. Just...... help? Kind words? Encouragement? Doesn't help that I'm off work now, so I'm home so much, and that's not been good for my mental health! Which adds to the cycle of just feeling like giving up and not caring. Thanks for listening to my rant.