[…] urination, diaphoresis, gastrointestinal upset, emesis and progressing to bronchospasm, bronchorrhea, blurred vision, bradycardia or tachycardia, hypotension, confusion, and shock
[openanesthesia.org]
[…] who had early symptoms of vomiting or abdominal pain; 73% for those where the first manifestation of intoxication was restlessness, irritability, drowsiness, stupor, or coma
[ncbi.nlm.nih.gov]
Shock and permanent brain damage may also be result from mercury poisoning. Some affected individuals experience mental confusion.
[rarediseases.org]