Are you feeling any better?
From your post, I am guessing that your blood sugars are normally under control just high this week since you started having dizziness and vomiting?
Your blood sugars are probably not causing the dizziness and vomiting - more likely to cause thirst and hunger. The dizziness and vomiting are probably causing the high blood sugars. When your body is under stress, it becomes insulin resistant and your blood sugars rise. Plus, dehydration causes your blood sugars to rise. You need to contact your healthcare provider and tell him or her what has been happening and be sure to emphasize this has been going on for a week.
(As for the dizziness on awakening, any reason to think your blood pressure is low? Are you on medication for blood pressure? Before trying to get up, pump your feet. Plus, tighten your knees, and the muscles of your legs, buttocks, and abdomen then release. Do this a few times to pump your blood back up to your heart. Or, do you just wake up and find you are dizzy? This could be an ear infection... just hard to guess.)
Hope you are feeling better.
In addition to all the good advice you got from WaveRider I suggest you see your doctor to see if your meds and insulin doses need to be adjusted as diabetes is an ever-changing condition. You are at risk for complications by staying consistently that high.
Changing lifestyle habits can go a long way in controlling type 2 diabetes. Proper nutrition does not mean junk food. Restrict & avoid refined sugars, practice and adhere to weight control, do some sort of exercise daily, practice stress management, and get adequate sleep. These are all important in managing this illness, the most important, along with proper nutrition, is physical activity.
And, keep in mind medication is there to assist you in controlling your glucose levels. The key word is assist. If you don't take the first step in controlling and managing your diabetes no amount of medication will prevent future complications.