Please help.

My absolutely beloved husband changed seemingly overnight from the most kind, loving, sweet, gentle man into an absolutely evil monster and I am lookign for ides to find out why.

All I can think of is that he had a brain injury in early 2013, when he fell down the stairs onto a wooden floor about 15 feet directly onto his head. The force was such to the back of his head that is "exploded" the top of his head and he lost a large patch of skin and hair.

At the time, he did not lose consciousness so he never had an MRI or CT scan or whatever.

He had bad concussion for about 3 weeks where he showed extreme tiredness, extreme irritability and a loss of personality. After that though he seemed to go back to normal.

He then started over about six months to have sleep difficulties, some irritability and frequently missed work which is very unlike him. He was under a great deal of stress at the time so I put it down to that.

Then he had some sort of complete breakdown, after which he became unrecognisable.

Since then he seems to be cruel, mean, vicious, lacks empathy, is glib and very angry.

He was diagnosed with depression which was quite severe and is being treated for it but almost a year later despite treatment he is not much better.

It is like the person I loved is completely gone. He feels no love towards me, and he was really loving and devoted before and I am just confused and at my wits end.

Could this be something to do with his fall? If so what do I do?