Why of course angst has a liquid form. However is over often breathed in and out as a gas mistaken for carbon dioxide.
Angsting All Over the Carpet by @catorius (Emif)
Harry in the fifth book as he angsted all over the carpets, walls, Order, Eaters, Umbridge, Hermione, Ron, Seamus, Hogwarts, Hagrid, the Forest, centaurs and all the other unlucky creatures that he came across.
"Dammit, Harry, you're angsting all over the carpet! And I just had this cleaned... shoo!"
His expression is too precious. I also didn't know angst had a liquid form. :D