If you opened a door to the spirit world, then you need to make sure you close it. You feel exhausted, anxious, overly stimulated, and exhausted because your energy is still being sucked into the door you opened.
Because you're new to Wicca, I'm going to say this as nicely as I can. DO NOT OPEN DOORWAYS TO ANYWHERE UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING. IT'S DANGEROUS!
Whatever method you used to open it, do it again, only this time with the intention of closing the door.