Unable to walk or sit or stand. Serious.

My father aged 59 , is hypertensive , and diabetic past 20+ years and is a CKD patient last stage and is going to dialysis past 4 years . He goes thrice a week to dialysis . Recently 3 days back he was having weakness and was falling while walking , so during dialysis , the team decided to put nervojen injec Even after that he is completely unable to walk or even sit up without any support He's not able to even stand . And now he's unable to lift his head and his hands too . He's feeling slight numbness and he is not able to open is mouth too , he tells its some rigidity  on right side . Admitted him to hospital docs are yet to tell anything . He's not having pain or anything But unable to do anything . His blood reports shows hb low abt 7.8 and potassium(5.7) and urea are on  higher sides . So are they any suggestions or is it something serious .