Hello Mr. Angry!
I am sorry you are experiencing emotions that seem to be getting worse when you were led to believe they would settle.
I am not a stroke survivor and so do not speak from first hand experience, but I wonder if this might yet be a passing phase or one of the lows in the highs and lows that are part of the journey of a stroke survivor?
Then of course there is the anger emotion that any human being regardless of whether they are a stroke survivor or not experience when triggered by some incident.
If this were to happen to me, I too would have gone ballistic after the initial shock. Your reaction is not necessarily a reaction of a stroke survivor - most people would likely react in this way.
Again, I can see anyone reacting to this. In the crazy world we live in these things happen and many of us are not comfortable with being monitored 24/7 and as you say essentially being treated like criminals. By coincidence I was in my local Waitrose supermarket on Saturday and was greeted by a TV monitor with me in the centre as I entered the store!!! Yes, the store has installed cameras instore and all customers are being recorded whilst they shop.
At the time, I thought about the legality of this as there were no signs to say there are cameras monitoring you and how the data (your image) is going to be stored etc. I can tell you I am not happy but for whatever reason, on this occasion I am not angered by it, but I can imagine there may be some who might be.
Going back to you and how you are feeling, you might benefit from having a chat with your GP, Stroke Team or your pharmacist to revisit the information you were given and see where you might be going next.
Also, In case you have not already seen this on the SA web page, there is quite a lot of information on the subject including a downloadable PDF.
Emotional changes | Stroke Association
emotional_changes_after_stroke_guide.pdf
Also, I wonder if there has been an incident in your life that may be contributing to this?
Has there been any changes in your routines, medications etc?
That is all I can think of but I expect others may have more to offer.
I wish you all the best.

Anger management trick
Have you tried this?
Take a deep breath through your nose, filling your lungs and stomach and hold for 10 seconds and then breathe out slowly through your mouth.
Repeat this 10 times.
Note:
Breathe in through your nose and out from your mouth.
This will calm you down.
In fact, you don’t need to be angry to do this. Do this every day and you will feel better and more relaxed.
This exercise takes oxygen to your brain and it helps calm you down.
Try it, you never know 