I drank a half a bottle of nyquil will i be ok?

If concerned you should have called poison control if not ok by time someone answers you you could be dead

There are many Versions of NyQuil and many sizes of bottles, making this a difficult question to answer. If you drink that much NyQuil, whether intentionally or not, you should call poison control immediately. They can guide you through whether you need to go to the emergency room or whether you will be OK. Do not ignore this advice. Call immediately. 800-222-1222