Other peoples' anxiety, fear, distress, anger etc may all be absorbed into your solar plexus chakra so that you feel some disturbance. Sometimes we are a target for other peoples' negative thoughts and emotions. These are powerful energies which we should avoid absorbing if we can. Equally, we could be in a situation such as a crowd or a meeting where these kinds of energies are moving about. Being sensitive means that you can absorb them easily, but also you can use your sensitivity as a positive attribute and take appropriate precautions.
The solar plexus chakra is the main point of entry for emotional and mental energies. When these are negative, the chakra needs to be protected. It is common to see people clutch their stomach when under emotional or mental attack or when they feel uncomfortable. This is the instinctive urge to protect the solar plexus.
It is easy to lose a lot of energy when you are feeling in an emotional state yourself. You can take steps to prevent this by putting the Solar Disc in place. It is important to release the energies you are generating. This can be done simply by releasing them through your throat chakra. This can be done by blowing, sighing or even singing until you feel you have released the build up of emotional energy, and also stops you from getting involved with the negative energy at a base level ie. Joining in with the negativity!
Remember that often the discomfort you feel in the presence of others is simply due to incompatibility between your energy field and the other person's. As the chakras start to process the energies you sense this as discomfort. If this happens the best thing to do is just relax and allow the full spectrum of energy to enter your system, put the Solar Disc in place and release your build up of energy, gently and let your energies come back into balance once again.
Here is an exercise to use as a protective cushion for the solar plexus.
To prevent the entry of any negative energies in the solar plexus chakra, visualise a golden disc of light covering it. Put the disc in place as soon as you enter an emotional atmosphere or when any negative thoughts are being expressed in your presence.