also there is a video of a guy that breaks the stalk on purpose. he sais something about the juices flowing up after (idiot). he even did it a second time after it recoverd. what im trying to say is donr fret, it can heal. you are seeing new signs of growth ya? this means that the plant is capable of reparing its self however this will probably stunt the growth. MABY MABY find some awy to suport the part above the broken part, i say maby because this could do more damage.

maby start LST if this is your only plant

good luck man!!