A. Independent pharmacies.
Reason - Independent pharmacies are owned by individual pharmacists or by a pharmacist partnership. Generally, these pharmacies provide specialty services such as compounding and selling medical equipment along with dispensing medications.
I would say C, his nutrition. Maybe eating more vegetables and fruits will provide him the energy to push harder.
I do believe it's all of the above. Although, it might not be trouble sleeping. That might be true in some cases, but not in all.
A phrase to describe a negative feedback loop could be: self-regulating (though I'm not sure the exact word you're looking for).
