Mark, when you say timeline, is there some doubt? As in, do I really have TMS (or equivelent)? Or, I have it, but when shall I give up...like when you buy an appliance, the day after your warrenty expires whatever it is breaks. Your sub-c knows the day it can stop fighting you, it just has to hold on longer than you. Something I have noticed is the experts say don't calander watch.
Journaling may not be very helpful for you, or lots of it anyway. People have come at this from differing angles. Do you know Ace1's keys to healing? They have been posted here, but might be easier to find on tmshelp forum. Don't we wish there was a magic wand?!
I came to TMS because of my foot, which had only been a problem for a few months, but I have come to realise I have had symptoms since I was a kid. I guess I've lived with them for 40ish years, why do more work? But, I see light at the end of this tunnel, and its more than just symptoms, its knowing me, and knowing others differently because I will be with them in better ways. This forum has people who post about changes that are far reaching, not just symptoms. I guess healing the parts of us that aren't physical and it being reflected in the physical. I want a part of that. I hope you will see that and want a part of it too.
I have not had 20 years of debilitating symptoms like you, so I don't know what it is like, and while I want to encourage you, I acknowledge I may be clueless to where you are and what is helpful. I have hope for you though, one way or another!

Lizzy