It makes sense that you sound mumbly - everybody heals at different rates but according to my daughter I sound like I have A lollipop in my mouth but I woke up a few days ago and sounded better - it takes time. I understand being self conscious - I have the opposite of you - I have melasma - it's been a pain in the arse for me - moreso because I do film work as well. Try auditioning when you mumble - so I get embarrassing believe me. Plus I am forever having to worry about makeup to cover my darkened areas... Everything shows up on camera. For now I told my agent I need time off but i would like to get back to it at some point.
Please do get your diagnostic tests -- just to be on the safe side... Take care and yes lets compare - you can pm me or email me anytime.
And yes this is an amazing place the people here are fantastic.