I have worked in an evil place too, so I know how bad it can be and how badly it can wreck your life... I am so sorry you're going through this.
You sound very, very stressed. And you're right, stress can lead to High Blood Pressure - depression, stroke, heart disease and so on....
Long term stress, over things like an evil work environment, can lead to a long term, low grade depression called dysthymia. Some of the things you mention warrant me telling you about this -- Dysthymia is characterized by anger, feelings of hopelessness (like, things will never get better), not having as much energy as you used to, thoughts of suicide, helplessness (like, you can't make things better, not matter what you do).
Is that a possibility?
If not, and you just feel overstressed how about talking to someone about all of this - if nothing else, than just to have someone commiserate over how bad the job is.
You don't need any long term deep therapy - just some really supportive light counseling - just someone who HAS TO keep your information private, and someone to bounce things off.
Keep looking for jobs and try to get out of there... Florida is a hige State and the US is a HUGE place. You can always just get out and go back later.
What are your thoughts?