Unwanted Invader, Outsider or a manifestation of self Options

For the past 2 weeks i have had an unexplained connection with something or someone that nether i nor anyone i have spoken to can identify. I am having feelings that do not belong to me and i am throwing terrible tantrums for no reason what so ever. I also do not realise what i am doing at the time. I thought this was some kind of external control until i experienced an actual being in the private section of my house. This is so well protected that not even my partner can enter it. This lead me to believe that this might be a manifestation of myself. If this is the case i do not understand why i can not control it. Any ideas. Advise would be much appreciated

For the past 2 weeks i have had an unexplained connection with something or someone that nether i nor anyone i have spoken to can identify. I am having feelings that do not belong to me and i am throwing terrible tantrums for no reason what so ever. I also do not realise what i am doing at the time. I thought this was some kind of external control until i experienced an actual being in the private section of my house. This is so well protected that not even my partner can enter it. This lead me to believe that this might be a manifestation of myself. If this is the case i do not understand why i can not control it. Any ideas. Advise would be much appreciated

I'm not saying this to be derogatory. I'm a psych student at the University of Kentucky, and I'm not qualified to make diagnoses yet, but this sounds alarmingly similar to mania or bipolar disorder. People with bipolar disorder often feel that their emotions are coming from some external source. Just my two cents.