Try and find other more natural things to relieve stress like vitamin B complex, drinking herbal tea such as chamomile, soaking in a tub of warm/hot water, listening to relaxing music, burning lavender or sandalwood candles.

If you feel you really need the Tylenol try taking one every 10 to 20 minutes until you start feeling better because it takes that long for them to kick in.
There is no reason to be taking 9 at once (don't know if that is how you did do it)