Answer: The physician would likely be most concerned about a possible drug overdose or intoxication.
Explanation: The patient's symptoms—confusion, tremors, and bloody nasal discharge are consistent with the effects of stimulant drugs like cocaine or methamphetamine. Stimulant overdoses can cause severe agitation, tremors, and confusion. Additionally, snorting stimulants can lead to nasal bleeding. Immediate medical assessment and intervention are needed to manage potential life-threatening complications from an overdose.