Sagittarius radiates positive energy, good vibes, and optimism. Genuine smiles and bursts of laughter seem to accompany Sagittarius. They have a strong immune system against anxiety, but they start feeling ill at ease when those beams of happiness die out in the surrounding gloom and doom.
When surrounded by negative-thinking people and naysayers, Sagittarius feels trapped. They soon succumb to stress and depression. It might be an idea to surround yourself with similarly cheerful people to bring this bursting energy back.