Check your nonprescription meds and supplements for stuff that can elevate BP.
For example, Sudafed and other decongestants can raise heart rate and blood pressure. So can some early versions of antihistamines. More recent antihistamines like Zyrtec, Allegra and Claritin are safer.
Many supplements and energy drinks contain stimulants. It gives the illusion that the main ingredient is working quickly. Besides caffeine some supplements contain yohimbe, guarana, ephedra and other stimulants that can elevate BP and HR.