Does caffenated coffee spike blood sugar? If so, should you limit the intake of coffee?

I need advise and help. Was not given any indication by the doctor on how I should proceed and what I need to do now. Was told only to take meds twice a day. No eating plan, what I should avoid or any other information.
Totally stressed out. Have no idea where to now. My blood sugar level at the examination was 12.4 with traces of ketones and blood in urine test. Glucose was 3+ in the urine test
Please help!!
My blood pressure was 150/90

I am Type 2, for 18ish years now. I recently had Oral Surgery and am on a soft/liquid Diet. My question is on Protein Drinks. The ones that have 25g Protein, 180ish Calories, and 5g Carbs. Are they an effective option to take when Blood Sugar is low? Or do I need something more like Boost or Ensure for that?

I have recently experienced higher fasting glucose levels over the course of about 6 weeks. Normally, I am at 80- 120 in the mornings, but lately have been about 140- 160. The only big difference of late, I can pin point is,.. I have been drinking, maybe 1 can of diet sodas with my evening meals. I have also had sinus/ allergy issues about the same time (farmers in the locale are harvesting- kicking up dust & mold). Just trying to get a grip on whether the issue is in the sodas (as my diet has… read more