Post covid recovery. Off from steroid?

My father,aged 57,diabetic and hypertensive, was covid+ on 18 Apr, initial ct score was 7/25 which increased to 21/25, hospitalized on 22 april and discharged on 8 may with intermittent o2 support at home on 5ltr with gradual decrease to 1 ltr as of now. He was discontinued from bp medicine due to low bp, probably cuz of steroids, but since past 3 4 days his bp is rising again in range 130/80 to 155/92 and irregular pulse between 70 - 101 while sitting to walking,monitored pulse while sleeping also, mostly around 60s but sometimes goes upto 95 during sleep also. without o2 support maintaining 95 96 in upright sitting position & above 92 while lying down, and uptill 93 while walking for 15 20mins . Sometimes o2 fluctuate uptill 89 while lying down but again jumps up to 94 & above. Want to know why pulse and bp suddenly started fluctuating again, is it weaning off from steroid? He is on Ecosprin av since he is at home & maintaining sugar levels fasting arnd 100 pp 140-180 on insulin