Hi Todd,
I have two thoughts (Thanks for helping out with answering questions, by the way. I appreciate it):
1) I have had success with syncope from arrhythmia and heart failure by giving magnesium injections twice weekly. I think I've been using 10 mg/kg injectable magnesium, diluted 50:50 in saline and injected subcutaneously. The owners can inject it at home. The idea is that the heart contains 23X the level of magnesium of any other body tissue, because of its importance in mitochondrial metabolism. Heart failure and arrhythmias have been shown to be frequently associated with low levels of myocardial magnesium. Injections can restore these levels without producing GI losses. If it's going to be helpful in the SSS, you should be seeing less syncope within a couple of weeks of starting the injections.
Another thought relates to whether you've got myocarditis creating the SSS. If so, Si Miao San might be a good choice, given its potent anti-inflammatory effects. Or Si Miao San with Dang Gui to address the Blood deficiency as well.
Lastly, in the event that Damp is obstructing the Triple Burner, it can interfere with Source Qi formation, leading to Qi deficiency and collapse. In this case, combining San Ren Tang with Xiao Chai Hu Tang might be an option. That would potentially fit the activity at Liver 14, although not overwhelmingly so.
So those are some ideas to try. Hopefully they work for you.
Steve