It is an honour for an INFJ to do this with someone, it means they see "your wonderful" and they feel safe. This feeling deeply safe is rare for an INFJ. Sometimes they trust the wrong person simply because they are tired of being alone and they say too much.
A lot of my symptoms stabilized (the physical ones) when the ataxia & thyroid issues balanced out after diet change...I seriously feel that many mood disorders are triggered by or are biproducts of ataxia, thyroid conditions, and food allergies/intolerances. Depending on what we eat at any given time explains the sudden variants in behavior.