Has anyone with severe ME/CFS(for any level of me/cfs) undergone a cardiology dobutamine stress echo test?

[I am sick]

What are immune biologics exactly?
I have immune issues due to mecfs and Addison's disease so I am taking for my immune system:
Valciclovir, lactoferrin, vit d3, transfer factor daily
Twice a week: a combo of echinacea astralagus black elderberry vitamin a and maitake mushroom etc

I take the prescription Vit D
1.25 mg /50,000 unit once a week.
Because test showed my Vit D level is low. Staying inside all the time will lower it .
I dont know anything about the others, other than the elderberry may be a good antioxidant.
I do eat the raw blueberries, cherries and black berries.