The reason why your toothache gets worse when you lay down and then gets better when you get up and walk around is because of the increased blood flow to your head.
When you stand up or walk around, gravity reduces the blood flow and pressure around the inflamed or infected nerves in your tooth.
And when you lay down, blood flow increases to your head and the elevated circulation raises the pressure around inflamed or infected nerves in your tooth.
But once you stand or walk around, the gravity reduces this blood flow and the pressure around the inflamed or infected nerves and helps the tooth pain subsides.
To help your toothache you can suck on some ice or hold some ice near the tooth that is hurting.
You can also take some aspirin or ibuprofen to help the toothache go away, which can take 25 minutes to 30 to 45 minutes to work.
Or for instant emergency toothache relief, apply some clove oil to the tooth that is hurting or even apply some Red Cross Toothache medication.
You can buy the Red Cross Toothache medication in a tiny bottle with little cotton balls that you dip in the bottle with the provided tweezers and then gently and carefully apply it to the toothache.
You should get near instant relief from the toothache, but may need to apply the Red Cross Toothache medication a few times or more through the day.
Just be careful to avoid getting it on your lips as it can cause your lips to burn and possibly swell, but if you do get some Red Cross Toothache Medicine on your lips, don't worry and simply wash it off and the burning will go away and swelling if your lips swell will go away pretty quickly.
You might also have a mild stomach upset as well, but it's worth it to get rid of the toothache.