Loneliness Support Group
Loneliness is an emotional state in which a person experiences a powerful feeling of emptiness and isolation. Loneliness is more than the feeling of wanting company or wanting to do something with another person. Loneliness is a feeling of being cut off, disconnected and alienated from other people. The lonely person may find it difficult or even impossible to have any...

If your not sharing what's going on inside maybe that contributes to loneliness
Have you lost an attachment? Sometimes a loss can spiral you downwards make a room seem empty and bleak. Maybe get some meds exercise and therapy for this
Are you socialising enough? Living with others is a quick way to get rid of loneliness
Sounds like you've had some sort of knock to a hard place, it will pass all things pass
Journaling and showing an interest in any random thought you have helps loneliness to fade too