Couch cover: sheet/sleeping bag/etc (Yonkers)

I'm in public housing, couldn't afford a bed so I got myself a couch my friend was giving away. However, it seems like the couch cover is infested with bugs of some sort since I'm waking up completely covered in bites. I dont think they are bed bugs so I'm really just seeking a new couch cover or a blanket of some sort or sleeping bag that could be used as a couch cover. Now, I really don't know if the whole entire couch is infested but I doubt it. That being said, if you have a random futon/couch you are trying to give away, that already has a pest-free mattress and cover, I would definitely take that offer too and replace the whole thing. At this point, just gotta find something clean to sleep in asap so I'm open to all options you can think of. Thanks much. Oh and it's not a very big couch at all - like a 2/3 person capacity but probably the bigger the couch cover, the better.