Hi JRW,
Welcome to our Internet family. You seem to have the same symptoms that I had when I was reacting. Almost every morning I would feel as if I had been hit by a truck during the night, and if it weren't for the fact that I had maybe 3 seconds to get to the bathroom in time to avert a major "accident", it would have taken me a long time to drag my miserable carcass out of bed every morning. MC can be a very cruel disease, as I'm sure you've noticed. I'll try to address your questions.
JRW wrote:Everything seems to hurt. Joints are complaining and muscles twitch all the time. Can this be related to the LC?
Yes it can. Those symptoms are typical except for the muscle twitching. That indicates either a serious B-12 deficiency or a serious magnesium deficiency (or both). Both also cause severe fatigue, but MC alone does a good job of diverting all of our energy to fighting the inflammation in our gut, so among the three of them you may be suffering from a triple whammy. Both magnesium and B-12 deficiencies can also cause brain fog, but B-12 is especially implicated because of your other symptoms.
JRW wrote:Main question is ..... Is the systemic fatigue experienced by others or am I conflating different illnesses?
Yes, virtually all of us have world-class fatigue when the disease is active, and it typically takes a long time to resolve the fatigue and brain fog.
JRW wrote:Would add that the last two years have been the most stressful in my life! Will spare you the details. But I have had longstanding mental health issues.
Yes, stress has the potential to trump almost everything if it is severe enough, on a chronic basis. For most of us, stress alone is enough to trigger a flare/relapse, and in combination with other issues it can be a constant threat to remission. Stress control is very important for MC symptom control.
Again, welcome aboard.
Tex