The signs, in my experience, of having a blood pressure spike are pretty subtle. How often are you taking your blood pressure to catch a brief spike like that? Here is how my doctor told me to get a log of my bp's to help them know what my likely typical numbers are. Take your BP ONLY 3 times a day and at around the same time. Feet flat on the floor, arm at chest level, relax. Make sure you have a good brand monitor. Is there a reason you check it so often? Do you have any history of hypertension? If your reading is going to 200 or 200 over anything near 110, you need to see your doctor. Nausea and vomiting with the high bp is something that can happen and in general, a bp that high with nausea/vomiting, dizziness, headache or chest pain is a reason to call 911 right away! I was diagnosed with hypertension 2 years ago and medication has it completely under control. Are you under a doctor's care?