Danielle Fishel has opened up about the heartbreaking “nightmare” she’s been experiencing since the birth of her first child last week. An Instagram post on Monday by the 38-year-old actress, best known for her role as Topanga on the sitcom “Boy Meets World” and it’s Disney Channel reboot “Girl Meets World,” Fishel said she gave birth to son Adler Lawrence Karp on June 24 ― almost a month earlier than the due date. Fishel wrote that she feels “helpess [sic] and powerless and useless” because her son has been in a hospital’s neonatal intensive care unit since she gave birth.

Her husband, Jensen Karp, also posted about the birth of their son and echoed many of his wife’s sentiments, writing, “Our ensuing rollercoaster ride of emotion, terror, vulnerability and unadulterated sadness has been one we did not expect.”

FIshel’s post — which includes a photo of Adler’s unused nursey — detailed some of what she’s endured. “… After doing an ultrasound, our amazing OB discovered fluid in [Adler’s] lungs that was not there during our last appointment only 10 days earlier - and thus we entered a nightmare we’ll never forget,” Fishel wrote. “We still don’t have Adler home with us because the deeply good doctors and nurses in the NICU are working diligently to find out why the fluid is there and determine the best way to get it out.”

Matt Winkelmeyer via Getty Images Danielle Fishel and her husband, Jensen Karp, in October 2017.