In the dream samples used throughout his book where he reports random experiences, the words fall, falls, fell, falling occur 72 times in 1,000 dreams. The dream theme suggests getting in over your head, or overburdened in waking life, which will sometimes go hand in hand with lack of self-confidence. Problems with finances, relationships, education, work, all can contribute to these factors. The best thing I can recommend so that you will not have such dreams is live the rest of your life in a cave as a hermit. Otherwise there is little way of avoiding these anxious feelings.
Anxiety appears in dreams under various themes.
Drowning is the perfect example of not just loss of control but being overwhelmed in life. According to David Fontana in his Secret Language of Dreams, Anxiety dreams are recognizable by the emotional charge that they carry. Typically, the dreamer has the sensation of trying to cope with several duties simultaneously, or of trying to complete a never-ending task. Another common dream associated with Anxiety involves an attempt to run but finding one's self tied down and unable to do so. Fontana suggests that such a dream may be the result of mechanics in the brain that prevent a person from acting out their dreams while asleep.