I spent years being what I suppose would have been agoraphobic. From about the age of 21 to about 26 was when it was at its most intense. The longest amount of time I went without leaving my house (not even to get the mail) was four months. I would make plans to meet with people or to go out with my husband (now ex) and daughter, only to back out at the last minute and get extremely defensive, angry, irrational, if I was pressured or asked why I didn't want to go out. I would refuse to answer the door, refused to answer the phone, was terrified of leaving the house. I didn't want to deal with all the things 'out there'. My personal hell was in my head and it took up every bit of space in my head that it could find; I couldn't handle adding any extra stress to my already awfully stressed state of mind. Most days, I couldn't even deal with cooking an extremely basic meal, light cleaning, washing dishes, even stacking dishes in the dishwasher. I was in a perpetual state of anxiety, fear, numbness. I was just a complete and utter mess.
I've worked through the worst of that, thank god, though it still rears its head: I still have intense anxiety if there's someone at the door, I still suffer intense anxiety when the phone rings, some days I literally cannot get out of bed except to go to the toilet. I'm a lot better but I'm a long way from being the functional person I should be.