I think it *is* likely your medicine extravaganza during your bronchitis may have temporarily elevated your liver enzymes. Just go get retested
in a few weeks. Also, mixing
Nyquil with the tylenol is a big no, no.
Nyquil has alcohol and, when mixed with tylenol, can do (tah dah) exactly what happened to you! I'm sure one time won't damage your liver, but now you know! Take care.