What is the best type of doctor to manage high blood pressure? I would like to see a specialist as the blood pressure is all over the place and I think I need to do a 24 hour test...

Blood pressure. Family medicine or internal medicine physician can manage this problem.
Cardiologist or. nephrologist are usual specialties of internal medicine who treat hypertension. Depending on your locality, there might be hypertension specialists. Consult with your local medical association for the proper specialist.