Prayer from the depths of your heart

Why would Yaakov, who longed for Rachel to have children, answer her cry with what sounds like anger? Rachel begs for children in Parshas Vayetzei, and his reply is sharp. The Malbim asks what changed for Chanah in the year her tefillah was finally answered, and the Ramban helps with Yaakov's words. A girl runs to the doctor next door because her mother can barely breathe, and he stops to ask how his jacket looks. It points to what real prayer needs, and when we are most likely to find it.