Struggling with Expressing Myself Due to Speech Impediment

I really struggle with expressing myself the way I want/mean to. I have a mild speech impediment that I'm very self-conscious of. The doctors say there is nothing to be done about it but I feel like I sound drunk and retarded even though my IQ measures 175 and I have a fairly extensive vocabulary... I also have mild aphasia that often causes me to cuss instead of saying what is actually in my mind, and it is embarrassing, but I don't know how to fix it... I also discovered recently while videotaping myself in an attempt to notice and correct my issues with speech and presentation, that in addition to a light tremor that never goes away, that sometimes the pupils of my eyes twitch back and forth (rapidly and automatically, similar to what you will often see in TBI or sometimes with cerebral palsy)... I do have a history of TBI and I dealt with severe abuse early in life but I don't want to focus on the part or feeling sorry for myself. Instead I want to improve NOW so I can talk to people without being ashamed of myself. If anyone had ANY advice to help with any of this or has had a similar experience, or even just has a word of encouragement, I would love to hear from you, and thank you.