Today i took an infusion for hypotension. i went to emergency with dizziness, fever, fast heart beat. please tell me how to prevent this in the future?

Dehydration: It sounds as though you were dehydrated. Were you recently ill with a decreased oral intake? Vomiting? Diarrhoea? The fever also may have caused you to lose fluid. The way to reduce the chance of this in a future similar situation is to make a conscious effort to drink extra liquids. Plain water and sports drinks are ok. Rehydration solutions are also good. Avoid sugary and caffeinated liquids.