I feel smothered and its making me sick

Basically i live with my parents and one of my step dad’s family members are staying with us for awhile rent free. The reason is unknown they wont really tell anyone. They havent told anyone their plans either like how long theyll stay etc. they’ve been staying so far for about 2 months. I hate it.


I dont know how to explain this but i feel smothered and unhappier with them staying here. 
I guess its just unclear what theyre doing here it feels like an invasion of privacy. 

Im starting to get headaches, i feel stressed more, i get more stomachaches, im staying up at night more, i feel less motivated. 

They are dirty and unhygienic, they lie a lot and i dont know their intentions. 

i feel like I cant really be myself as much anymore, like i cant talk on the phone or to other family members in the house as much anymore because i really hate nosey people who hear things. I cant poop in my bathroom comfortable anymore because his room is directly next to the bathroom. I cant watch bideos outloud anymore or talk to myself or my pet. 

I just dont feel good physically and mentally since they have been staying here and im not sure why or how to fix it