Spiders don't like citris. They taste with their feet and will avoid citris. Clean your room with natural cleaners that contain lemon or orange oil. Also keep all clothes off the ground, and vacuum at least once a week (being sure to get in the corners and under and behind furnature with the hose).
Trust me, I hate spiders in my house too, especially my bedroom. One crawled into my dog's ear and caused his eyes and cheeks to swell last year. So I'm diligent about fighting them, especially cleaning after it rains when they tend to find refuge in homes.