I was recently given 2 12 hour sodium and potassium IV drips due to a potassium level of 2.3 and a low sodium level. I spent two nights in hospital. After returning home I woke the next day with a severe headache which lasted all day and 5 days later my thighs are still very swollen which I presume is water retention as I gained 4 kg literally overnight. Is this over infusion and how long for the fluid retention to go as my legs feel so heavy.