I'm sorry, it sounds stressful for you To see a therapist would be the best thing, if it doesn't stop. Since it started after going inpatient it's highly probable that it's related to that. Maybe you missed her very much there and now you are afraid to be separated from her again? Or you were very 'cuddled' by the nurses there and you want a special relationship also now? Just ideas, I don't know if these can actually be reasons for this.
Wish you all the best