LVEF 20% , dilated cardomyopathy.

My brother jiten age 28 was admitted in cardic care unit on 16th apr 2022, ech shows lvh + lae + , t inversions in v5, v6 and trop was < 0.02 2s echo showed global lv hypokinesia lvef 20% moderate TR, paitent was intubated and put on ventilator support i/v/o suddent onset of sob associated with sweating, hypotension, vomiting and decrease 02 saturation on 17/4/22, Cag was done on 18/04/22 which revealed normal coronaries, patient was extubated on 18/4/22, aicd implantation - single chamber, mr conditional, Medtronics done on 20/04/22, post procedure paitent stays in hospital was uneventful and is now discharged in stable condition and medication given dapaone 10mg, concor 2.5mg aldacatone 25mg dytor 10mg pantacid 40mg ceftum 500mg levoflox 500mg alprax 0.25mg now in the evening his bp becomes low and he starts vomiting and after vomiting skin become pale and right calves pain for a while. what is the best solution to recover slowly and positively ?? cough is there.suggestions?