Palpitation is an awareness of the abnormal beating of the heart. It may occur in people with or without heart problems. Heart palpitations when lying down is not a common occurrence and can be caused by various factors.
Flat feet occur when the normal foot arches have partially or completely collapsed. When the foot is put to the ground the inner or middle side of the foot comes down to the floor rather than remaining raised. This can cause the whole foot to roll inwards (this is called over-pronation).
When the arch pain is pronation related (flat feet), an orthotic designed with a medial heel post and proper arch support is recommended for treating the pain. This type of orthotic will control over-pronation, support the arch and provide the necessary relief. If the problem persists, consult your foot doctor.