Good for you for recognizing your limits right now. Going slow will help you in many, many ways.
The anger will subside in time, but for now, allow it to surface and exist. Anger is a very healthy emotion that we all seem to allow ourselves to be deluded into thinking it is "bad" for us to be angry.
Not true. So, let it go when you feel it. It will do nothing but help you in this process.