After a ritual, you're probably going to be a little lightheaded. That's because all that energy you raised has made you giddy and given you a sort of psychic high.
This is when you do a procedure commonly refered to as "Cakes and Wine" or "Cakes and Ale". The "Cakes and Wine" is, essentially, a ceremony to ground (to get back to normal after the psychic high of a ritual) and to restore your energy. At these ceremonies, there will most likely be a small cake or biscuit (at coven rites, a tray will be passed around) and a cup of some drink, often wine or ale. I'm underaged, so I use grape or sometimes apple juice. For those of you who do not want to drink wine or ale, or can't, then I would strongly suggest you use an alternative drink. The cakes and drink are consecrated, passed around if in a coven, and eaten. (Touching the palms of your hands to the earth also works to ground some of the energy.)
The Gardnerian tradition has a specific ritual thingummie for this. If you want to find a description of it, get Buckland's Complete Book of Witchcraft by Ray Buckland.
And the ritual is over.