I'm agoraphobic too. For just over 2 years now. I'm house/area around the house bound, but it's getting better.. but I do have that problem of finding it easy some days and really hard the next. I think it comes down to tiredness, every feeling is 10% stronger when you're tired so it feels worse than it is. Also dehydration, if you're dehydrated you can actually get the same symptoms as panic, so drinking plenty of water is a good idea too. I think alot of it goes on mood too, which can come down to hormones or the weather. If you're a sensitive person then it'll affect how strong the phobia gets. Congrats on the driving! That's an excellent step forward