Have you talked to your doctor about this? YOu probably should. You could be having a bad allergic reaction or have something else going on. He might need to give you something more.
It could take a week or 2 to get out of your system- it shouldn't be affecting you this way.
Things that can help you sleep: (make sure you ask your doctor about these, since I'm not sure what's really wrong with you.)
1. avoid all caffeine including chocolate, coffee, tea, and sodas; if you need some, then avoid them for 6 hours before bedtime
2. find out about taking melatonin tablets, an over-the-counter sleep aid, or something the doctor can give you.
3. Keep the lights dim for 2 hours before bedtime, and sleep in a room that is as dark as you can stand it. This will cause your body to make melatonin, which is a sleeping hormone. If light shines in your window, you should put up thick curtains or a blanket.
4. Take some calcium every night before bed. I take it with orange juice, which helps it be absorbed better, and helps it not to hurt my stomach. Take 100% of your daily recommendation, and even then, it can take a few weeks to start helping. This helps a lot of people sleep better.
5. drink some warm milk and honey.
6. There are herbs that can help you sleep. You can research them if you want. YOu can make teas or take capsules.
7. You can try taking a multivitamin/multimineral or a vitamin blend to help with stress, but don't take it too close to bedtime. Also, make sure you are eating fairly healthy.
8. Don't exercise or be too active too close to bedtime.