High blood pressure can be disability depending on (1) the specifics of the condition ("high blood pressure" is a broad range, not a single binary condition that manifests identically in all people suffering from it), and (2) the persons usual line of work -- disability determinations are generally [1] made based on your ability to do the work you did before the disabling condition manifested.

> High blood pressure is not a disability.

Your high blood pressure, as it currently is, is clearly not a disability for you in the work that you do. That does not mean that high blood pressure is not a disability.

[1] The exception is that each state agency also has a "List of Impairments", a catalog of specific conditions and combinations of conditions that are considered unconditionally disabling; if you have a condition on that list, or one judged as severe as one on that list, you are considered disabled without analysis of the specifics of your previous work.