Dog Peeing and Pooping Inside?

I have had my dog 4 years now. He is house trained, but the last few weeks he has been peeing in the house nearly every night and pooing sometimes too. He has also been doing it during the day when I'm not there. He knows he's doing wrong. He does it in the same place every time and when I walk in and walk over there to check he puts his head down and crawls under the table.

I have had his bed in the conservatory room since I've had him and the last few weeks he refuses to get into it. He sleeps under the table in the kitchen. Sometimes I do pick him up to put him in his bed and he will just stand there looking terrified and when I go to walk out he runs out and goes under the table. He refuses to go into that room. When I get up in the mornings he's standing at the door waiting for me. What is wrong?

By Danielle from Ireland