Anger definitely affects blood pressure, but as atengnr said, it will subside once the anger passes. However, if you are "bitter" as you describe, this can affect your overall health. The constant presence of anger or anxiety has an impact on your blood pressure.
I had the most odd experience a few weeks ago. I rarely get angry. I mean, really angry. Yet, at work I had an episode with a coworker that made me so angry that I felt a pulse in my sinuses all the way down to my chest. Then, when I went home about 20 minutes later and was retelling the situation to my other half, I flushed bright red from head to toe... then it went away and within seconds it happened again.
I am on Bystolic, a beta blocker, and I can only imagine what my blood pressure must have been during that episode.
I think for your overall mental and physical well-being that counseling would help. I know posting here absolutely made me feel better when I was going through the musical chairs of finding the right HBP med. Attending counseling and sorting out why you feel as you do could assist in making you feel better as a person and in turn impact how you physically feel. Mental state has a lot of control where we would believe it would not.