Puffy feet ankles

Hi sorry to bother you I'm 72 yrs young recently while in hospital for low ox2 shortness of breath I was put on predestone for 5 days got my px2 back to 91ox2 they also put me on a pill called fuderside I think it was called a fluid tablet any they were driving me crazy peeing continually nauseus shaky plus I read where should not take with cortasteroids ect pain meds ,I had to stop taking them I felt so bad it's been a week since I had any my feet are still puffy until I elevate them again I realise it's probley my heart not pushing blood enough .also I could not get take home ox2 until iv stopped smoking for 6 weeks icant seem to stop plus my wife of 40 yrs has decided she likes smoking omg I can't walk out on her as she is doing it bit hard loss of memory seems to be getting worse I just don't know how to handle this problem .has anyone else had experience with this type fluid tablet ? Thank you from Australia