All symptoms you describe are very common detox symptoms. If you read my posts, you will know I have gone through the same things, except for nausea.
This is too late, but for next fast...
You should never use toothpaste or mouth wash when on a water fast, these are full of chemicals that are toxic for us. Tongue scraper is the way to go.
For mucus you can drink warm water. Before bed put a few drops of castor oil in your nostrils. Take turmeric powder after you break your fast.