Illness in a dream rarely predicts actual sickness -- it more often reflects vulnerability, a need for care you haven't been giving yourself, or some part of your life that's fallen out of balance. Recovering within the dream can point to a genuine return toward equilibrium already underway.
Whosoever contendeth with another & overcomes when the significators are in signs bicorporeal, gets a great victory; if overcome, looseth much; for then the good or evil is doubled. - William Lilly (1602.-1681.)