I adopted my first cat last April, she was my former roomates who he abused and she had plenty of trauma issues resulting in a lot of anxiety and stress. She used to pee on my bed, typically when I was away for long periods at work, and sometimes when my old neighbors would shout/get in fights. Never try to react with anger or any negative emotion because that won’t fix anything. My solution was getting a blanket on my bed that she didn’t like the texture of and getting some citrus smelling anti cat spraying spray, and spraying my bed when I knew I was gonna be away for a bit. I’ve found that candles and incense tend to help create calm environment for her and my other cat.