@bbjaide- You must feel like a pariah. How awful you must feel, even as you understand the reason. Has a periodontist checked your gums for periodontal disease? I'm also wondering if you've had blood work to make sure that you do not have any infections.
I also think that the amt of phlegm might be a reaction to what is causing your bad breath.
I wish that I could offer more hope and encouragement but I also don't know how this can be solved. Could you be taking any other medications that could cause this?
https://www.mayoclinic.org/search/search-results?q=bad%20breath
I also found this for you: https://www.healthline.com/health/diabetes/bad-breath
Have you seen an endocrinologist for your diabetes? It may be worth a visit.
I understand that you probably sick of visiting doctors, I really do. Earlier this year I needed a break from all of my doctors that treat my lung disease. I thought that I would scream, leave me alone!

Will you please let me know if you have been to any of these specialists that I have mentioned?

@merpreb Thank you for responding, Yes I have seen both a Periodontist and I see an Endocrinologist for the Diabetes, My A1C has been stable at 6.1 for the last 5 years, I am just desperate.
I thank you for taking the time to do some research.