“Low BP after severe fall?”

I am a 57 year old male. I have Stage 4 liver disease and an enlarged spleen. I have portal hypertension, anemia, cellulitis. My meds are Lasix, Lyrica, Integra, Nortriptyline, and Bactrim. Yesterday after falling, I went to ER. I have no broken bones. My concern is BP is 118/53 and it has always been perfect 125/72. What diastolic number is dangerous and should I return to the ER?