Okay, a short story has a beginning, middle and end. It has to be wrapped up and finished within the word limit and something must happen or change during that time. It has to feel complete when the story gets to the end.
I found you a website that goes through the essential components in a story. Plot, characters, setting and theme. Even though you only have 150 words, your story needs to be set somewhere, perhaps in the acupuncturist’s office/Chinese medicine store… it should have a theme…perhaps that alternative medicines can have some strange outcomes (eats pig ears and his ears grow) ... you need characters (the acupuncturist and the patient) and you need plot…what happens, in what order and what is the outcome.
It is going to be hard in 150 words I agree. Why not do a bit of mind mapping to start with. Think about each of the themes and let your mind run free, just write down everything you can think of. Then see if you can use any of the things you thought of by connecting them together. I agree with @math_nerd, be out there. You have to make an impact in barely any words.
Hope this helps a little!! Have fun with it. That is always going to help you get a better result.
http://www.horton.ednet.ns.ca/staff/scottbennett/web/STSTOR~1/sld002.htm