Answer:
Hypoglycemia.
Step-by-step explanation:
The improper balance of the insulin hormone in the body can cause the diabetes. Diabetes are of two types - diabetes insipidus ( Type I) and diabetes mellitus (Type II).
The person has type 1 diabetes and has confusion, headache and tachycardia. This symptoms is occur due to the hypoglycemia as he has low blood glucose level in the body. The hypoglycemic condition results in confusion and headache. He also drinks beer that is mainly responsible for his hypoglycemic condition.
Thus, the answer is hypoglycemia.