In Psalm 51, David asked God to restore the joy of His salvation after he realized his sin against God - adultery with Bathsheba (he'd also murdered her husband Uriah) - and confessed it to God and repented (turned away) from it. Each of us can, too!
No matter how bad your situation seems, it could be worse! When you're down, thank God for even the air that you breathe, and praise Him; it'll change your perspective!
Rinse your mouth out with water, and either swallow or spit it out. Don't brush your teeth without first rinsing (after eating glucose tablets); otherwise, you can scratch the enamel off your teeth with the glucose tablets.