First of all, it may take 15 min to 1 hour for the medication to work. In the mean time you can try to get her to relax. Perhaps a hot bath/shower. Giver her message. Dim the lights, allow it be quiet. She can try Tylenol in about 4-5 hours. If it's that severe, it may be a migraine... so if there is no change after doing some of the above, you can take her to the ER and they may be able to help her further there.
Here is a site about migraines.
read here
Hope this helps, If you need anything else please feel free to ask. If you found this helpful don’t forget to click the *accept* button!
Healthcare Expert
17+ years, Healthcare Expert