I do a few things that I find work.
As far as stones go I keep a combo of black tourmaline and jet in my pocket. When things get intense I hold them in my hand.
I wear black kyanite and tigers eye around my neck. The kyanite helps ground the unwanted energy and the tiger's eye fills me with loving and focused energy.
I also keep red garnets in my pocket, they keep any negative energy from turning inward.
Setting very clear boundaries with people has been amazing for me.
I also sleep with stones, that helps clear out the energies of the day so I can start fresh in the morning.
Loud noises can help shift energies.
Being aware of what energy is mine and what is not helps me give the energies time to leave my body.
Also deep breathing, with a strong emphasis on the exhalation really helps me. When no one is around I blow raspberries. That helps me eliminate the old energy allowing more room for new energy.
I have had the experience were old copping strategies stop working.
I have also found that I have to clean my stones every night. Talking to them and thanking them in advance every morning for their help through the day.
I also recently bought a decent size peice of hematite. It was pretty rough the first few days but now I feel even better.
Free writing helps me too. I don't do it all the time just when I need to.
I have also made a grid of selenite around my room to create a safe space for my energy to flow.
I sleep with blue and green kyanite and malachite under my pillow. I often hold the jet and black tourmaline in my hand and have added the hematite. The first time I did this I was surprised to wake up with them still in my hand. I slept well and felt amazing the next day.
I have also found that for myself I am like you said as a radio. I am always tuned into the energies of my surroundings. Once I accepted this I have found it much easier and I enjoy it. I feel like I am tuned into information that most are not. I have learned that what I feel, see hear, smell, and hear are all empathetic information. When I don't interpret it, I get overwhelmed because I am not telling the energy I don't want to go. When I pay attention to it which, as difficult as I know it can be, sometimes means eye contact I am put in a sense of strength.
I am always receiving empathic information. For example I have a co-worker I avoid. She is a very nice person but there is something very of balance about her energy. When ever she talks I go through a series of different emotions. I have recently realized she is sick and I think somewhat depressed. That series of emotions I go through are hers which is why I don't want to be around her, because she doesn't want to be around herself. I would actually like to get her some stones but she is not open to it. So I keep my distance as much as I can. I am polite but I do very little interacting with her.
I think some have to find their own way as much as I would like to help. Her own energy will not let me in. So I listen to my instincts and stay away.
Hope there was something helpful in all of that.