Poor, sensitive Crab! Ruled by the Moon, your moods can soar to the heights and down to the depths all in the course of one day.
Your loving, nurturing nature is a gift, but all that empathy can make you susceptible to the toxic moods of others. Research suggests that just being around anxious people may be hazardous to your health.
Do what they tell you to do on airplanes and put on your oxygen mask first. Not literally, of course, but employ whatever relaxation technique works for you to calm yourself down. Only then can you help your anxious friend.