I see your point; however, I would like to make seldom known clarifications.
First off, demonic or inhuman entities are actually more rare that most people would think. These days its the first place that most people look because its been sensationalized in the media. But the reality of the matter is, its very rare and the individual symptoms can often be attributed to other factors.
Having said that I will say that some of the things you've described could be interpreted as a potential inhuman event. Although by themselves they do not constitute enough to even come close to such a diagnosis.
In all cases, whatever the issue is that you're having the most important aspect I can stress is to remain positive and attempt to approach it calmly and with an open mind.
You described a sense of feeling negative emotions in the house, that could actually come from a large variety of things ranging from a psychological reaction to some events to static negative energy built up in the house due to either one strong event or a repeated history of negative energies. Could also be a haunting by an individual who harbors strong emotions which are "rubbing off" so to speak.
One immediate question that comes to mind is, are you the only person effected? Are there others in the house effected in the same way. Is it affecting only certain areas of the house. I would be curious to do an EMF sweep of the house to see if there are some strong EMF sources which could be causing some of this. Sometimes badly insulated electrical wires or AC magnetic fields can create strong fields that can in turn alter moods, create mild hallucinations, or have other psychological effects.