The bug bites are killing me

I live in a pretty small apartment and they’re pretty sparse, but every morning I wake up covered in welts and the itching is horrible. I haven’t been able to sleep good at all this week and I’m starting to lose my patience. They’re starting to crawl on my skin too. I see them on my skin and I literally have to brush them off. I just don’t know what to do. I’ve done everything I can to seal the apartment and they’re still there and they’re still biting the shit out of me. I just don’t know what to do. Has anyone else been experiencing the same thing. I feel like I’m losing my fucking mind.