Hello, it's good to hear from you again!
I'm sorry to hear that you are struggling with negative muttering and thoughts. It can be very distressing to feel that you have little to no control over what you say or think. But with some research and a bit of work, you can change this habit.
The two books you wrote about seem to be helpful. The one, Conscious calm, says it integrates both Eastern thought and Western thought which may or may not be helpful to you based on your own personal beliefs. But you may be able to use other parts of it to help yourself.
It could be that you are saying bad words out loud because of an OCD disorder. If you feel it is involuntary at all, that could be the cause. It could also be a tic which is anxiety based. You may want to talk to your doctor about the possibility just to rule it out.
Here are some other excellent anxiety resources that I use a lot that may help you:
On line links:
The Anxiety and Phobia Workbook by Edmund J. Bourne
The Cognitive Behavioral Workbook for Anxiety: A Step-by-Step Program by William J. Knaus EdD and Jon Carlson PsyD EdD
Coping with Anxiety: 10 Simple Ways to Relieve Anxiety, Fear & Worry by Edmund J. Bourne and Lorna Garano
Here is some information about tics:
And about OCD:
Let me know if you need more resources,