Pumping at work

So when I was hired I was told I would be getting an office because there were renovations and everyone was being moved around. They knew I pumped when I was hired. I've got no other office to go pump in so I have been pumping on the bathroom floor and it's gross. I asked my boss before if there was somewhere else I could pump instead of using the bathroom and he said "oh no it's fine to use the bathroom". 
Well I found out today that I will indeed not be getting the office I was told I would be with a lock on the door, instead I'll get a cubby area in a multi office space, and it's not enclosed. 
Also, the lock on the bathroom I have to pump in broke this afternoon so I'm using another one :( the customer bathroom. Which is super gross. They don't have any office I can use when I need to pump
Idk what to do and my supply is going down because this is stressing me out :( I am so frustrated with work. I'm on the verge of leaving.