It might be time to revisit the Empath Survival Guide.. a form of volume control you havent tried yet?
Do you use crystals?
Everyone is different so they may work really well for some & not for others, but if you haven't tried them yet.
I would suggest any one of these to carry with you in your purse, pocket, etc.
This way you can place it in your hand should you need to (tumbled stones usually work well and are relatively small & cost less then raw stones, the choice is yours.) I like both.
Red Jasper (In many cultures it's considered the Original Warrior Stone used for Protection & added Strength) It also is noted to Block Negativity pretty well.
Black Obsidian ~ Used primarily to Block Negativity
Hematite ~ Used primarily to Block Negativity