Like the one that doesn't appear in the link you gave ?
Here is aspirin possible side effects :
Nervous system Central nervous system side effects have included agitation, cerebral edema, coma, confusion, dizziness, headache, cranial hemorrhage, lethargy and seizures. Tinnitus and subjective hearing loss (or both) may occur
Whew, aspirin is a hell of a drug after all.
I don't discard your story, but please understand that Indo's safety profile is even better than more mainstream NSAIDs. Plus it is applied topically, which reduces the systemic absorption by a great deal. What happened to you is a rare occurence.