The allergy that triggers cardiovascular system is called as heart allergy. You can prevent it .by avoiding foods that cause allergic reactions in you, check weather report. If pollen senstivity is high ,stay indoors
Choose wood coverings on floors instead of a carpet Keep windows and doors clean.
Clean sofa, cushions ,matress regularly through vaccuming Avoid dry dusting. Clean home with wet cloth Use allergy proof pillows, matress available in market. Moreover go for a homeopathic treatment. It shows wonderful results in such kind of allergies.