How do I stop being anxious at other people's houses?

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I have general anxiety and maybe even slight agoraphobia. I am most comfortable in my own room, anywhere else and I start to feel anxiety building up. I've been wanting to try and push myself to be out of the house more, so I started doing some dog walking. It has been going pretty well, it's not much pay but I enjoy being able to set my own hours without having to interact with people much, and I like animals.

Earlier this week I got an offer to do dog/housesitting for 2 nights while the owner is interstate. My initial instinct was to say no, but I tried to get out of my own head for a moment and look at it as an opportunity to test myself, to dive in the deep end so to speak.

I've been at this house for 25 hours now and guys it's been my own personal kind of hell. My anxiety has been a constant 9/10, I keep tearing up and crying intermittently. I don't know what to do, I just want to go home and be in my own bed. I can't relax or calm down at all, the dog is pretty high maintenance too which makes me feel like I'm letting him down.

How can I get through the next 29 hours? This is the worst I've felt in a really long time.