Anyone else have their diabetes just kick them in the ass

Okay, so I am monitoring my blood sugar and exercising, plus working my diet.  But, two days this week I got taken out and I cannot figure it out.  The first day I skipped breakfast (okay, I know) and had lunch late.  It was lunch out, a salad, too big of a ribeye and green beans. I stuck to the water and skipped the dessert.  My sugar seemed fine when I took it in the car, but by the time I got home I had a headache that was disabilitating.  I ate a banana, no help.  A salad, nada.  Obviously, the tylenol had no effect.  I could not read, sleep, sit still or anything.  Finally, I was able to drift off to sleep around 11, and I woke the next day just fine.

Than two days later, sugar seemed high all day and right after dinner I could not keep my eyes open.  It ws barely 7 and I was drifting off to sleep.  For dinner I had homemade pizza, with meatballs and pasta with meat sauce.  It knocked me out.  I went to sleep at 8am and woke up the next morning at 7am.  Again, felt fine.  Today, no problems whatsoever.

Is this normal?