What keeps biting me?! 🕷🐜🤬

For several weeks I have woken up to some very itchy bites. They start very small, almost unnoticeable and are almost always on the side of my arms in the same area. I have only ever noticed it one time on my leg by my knee and a couple times around my feet. When I scratch them they get much bigger, as if they are swollen and the whole red area itches intensely. I have tried using Benadryl as well as anti itch cream with no help. They go away after about a week or two but are hell to keep dealing with! My boyfriend never wakes up with any bites, this is only my issue. We use a mattress protector that covers the entire mattress, I clean our sheets regularly, I vacuum regularly, we don’t have any pets, I haven’t seen any spiders unless they are on the screen door but I usually squash them or get them back outside. I haven’t seen a single bug of any kind on or near our bed. It’s really starting to drive me insane! Please help!