I got diagnosed last year and I completely understand how it may make you feel overwhelmed with all the lifestyle changes and new information to take in. I also know the frustration of doing everything right but not getting good results with your blood glucose control, it just happens some days. Just a couple of weeks ago, I had a full day of uncontrolled sugars, even though I was eating broccoli and boiled eggs.
The best advice I can give you is to know that there are many more factors that affect your blood glucose besides your diet. Stress, hormone fluctuation, temperature, even how rested you are are a few of the
over 40 known factors that can affect your blood glucose. And be aware that sometimes you may eat the exact same thing, and some unacounted for factor may lead to completely different readings from the same behavior in two separate occasions.
Also, don't take your blood glucose readings as gradings for a test or your quality as a patient. The readings are just information that will help you experiment and see what you can tolerate well and what spikes you, and how to adjust these behaviors to get better control over your condition. I know sometimes I dread checking at my BG after I indulged in some cravings but then I remember that, if I don't take the reading, I would never know if I can treat myself with a few snacks once in a while.
Another thing is, exercise is a very effective way of controling BG after a meal. It doesn't even needs to be intense, just a 30 min walk after a meal is gonna do a great difference.
Finally, take things one step at a time. One bad day of high blood sugar won't kill you immediately. It's all about the cumulative damage over time, but this damage is reversible, in most cases, as long as these days with high BG are the exception and not the rule. Just keep experimenting and keep up the good spirits, stressing over bad readings is not gonna help you, since cortisol increases your insulin resistance, and not eating doesn't helps either, it usually just makes my liver release more glucose to keep up with my energetic needs, so my glucose stays the same or goes up if I skip meals. Better eat some low carb foods, like leafy greens, meat, eggs, cheese and try to take a walk in the park, if possible.