constipation, costiveness in chest or intestines
痞 centers on a blocked or stuck internal condition: constipation or a feeling of costiveness in the chest or intestines.
痞 combines 疒 (sickness) with 否, which likely contributes the sound ヒ and the idea of negation or blockage, fitting the meaning of internal obstruction.
The sickness enclosure 疒 wraps around 否 (negation, blockage). Picture a blocked pipe inside the body causing constipation and chest discomfort.
For ヒ, imagine the sound of a strained 'hee' when trying to push through the blockage: hee -> ヒ, and the sickness enclosure shows the internal struggle.
to feel blocked (of one's chest or throat, due to grief, anxiety, illness, etc.); to feel pressure; to feel pain