Unwelcome houseguest :(

Hi, I'm a 15 yr old girl and I live with just my mum. Three months ago our builder became broke and homeless, so my mum, being the softie that she is, offered for him to stay at my house. I've never really liked him but now, because he's been here ever since I have depression and anxiety. I have developed such a hatred for this man and every time he talks, sighs, coughs, rubs his bald head or stomach I run to my room and cry. I really want him to leave, may I also point out that he's using my toilet and sink.(I can't shower or do some of my daily tasks unless I know he has left the house)  My mum knows that I hate him but she doesn't realise that he makes me so sad, he has never touched or said anything to me that is inappropriate, his mere presence is enough to make me roll into a ball and cry. I just feel so worried and depressed every minute of every day now and I just want him to leave. Thankyou for letting me vent, if anyone has had a similar experience please let me know so I don't feel so alone.