Shalom Rexine,
I will pray for you also. I have found fasting to be a wonderful cleansing tool to incorporate semi-frequently. A book on the subject that I would highly recommend is "The Miracle of Fasting" by Patricia Bragg.
Aside from Yom Kippur, which requires complete fasting, I would recommend easing into it as AWB advised. Don't go to extremes. In the beginning, I would recommend juice fasting. After you've gained more experience with it, go to diluted juices, and then eventually just water.
You may feel tired and irritable for the first day or two, but as AWB said, by the third day the hunger ends. Then a wonderful, light, euphoric feeling takes its place that is conducive to deep prayer and meditation. Check out Acts 13:2-3, Acts 14:23-25, Ezra 8:23, Joel 2:12, 2:15. (There are tons more scriptures like these, too.)
When you end the fast, one of the most critically important things is to eat very little. For as many days as you fasted, take the same number of days to gradually return to a normal diet.
Don't fear. We are not built to live very long without water, but we can go months without food. It takes many months before starvation begins. Many people fast periodically for 3-10 days, and do this several times a year, and/or fast a day or two every week. Fasting resorts supervise longer fasts, generally up to a month. It strengths the immune system and people come alive and radiant. So unless you are in poor health, you need not have any fear whatsoever of fasting for just a day or two.
Love from Sister Heaven Sent