Make sure you step down from the effexor before starting. You may wish to try a different med. If not, valerian root can be calming at bedtime. Try relaxation, meditation. Self hypnosis videos on YouTube can be very helpful. Anxious moments happen. If you have clinical anxiety thast isn't easily relieved or interferes in your daily living, you should be treated by a specialist. I agree...lavendar essential oil sprinkled on your pillow can be very relaxing.
Try your best to stay in :this moment". That is actually a good meditation. Good luck.