Hi Greg,
I'm so sorry to hear about the state that you're in. I want to address one thing first: It sounds like you're having thoughts right now that you don't like. Unfortunately, those thoughts may go beyond the scope of something like this message board and it's ability to help you in the moment. So I'd like to encourage you to seek out a professional near you - in person - to talk about how things are going. Often we think we can deal with this TMS stuff alone but having a person - a trained professional - to help us not only with the symptoms but also our feelings and thoughts about them (often a missing piece for many of us) is incredibly important. Please seek someone out near you to help you with those.
As for visualization: it does require a little experimentation. Aside from talking to your TMS, I - and many other therapists - ask our clients to visualize it. I once had a client - they came up with this all by themselves - who ended up visualizing their unconscious as a dark basement that they went down. They heard the most terrifying sounds coming from the basement but when they turned the flashlight on they saw the sounds were coming from these grotesque yet quite small and even cute little creatures (her buried feelings). She actually ended up inviting them to come upstairs and sleep at the foot of her bed at night.
For her, this visualization didn't unearth anything about the repressed emotions but it did directly address her fears of them and helped her get over a sticking point with her sxs.
I encourage everyone to sit and explore - even by drawing - what their TMS, unconscious or repressed emotions look like... when we do, we access different parts of our brain that allow us to process things anew.