I don't have a whole lot of advice but we have been there. A year and a half ago we were almost out of funds and had to move halfway across the country. It ended up working out GREAT, but it is a big adjustment for everybody. A lot of what your DS is doing sounds like normal toddler behavior. Potty regression is normal I think although big changes can certainly trigger it. Kids can pick up on adult stress too but there isn't a whole lot you can do about that, you are doing the best you can given the situation. Really, you are doing all the right things it's unfortunately is just going to take time to sort it out. I do have a couple of ideas though:
1.) Routine routine routine! Seemingly impossible now in the throes of moving but do what you can. Have a consistent bedtime and mealtimes to start with and add a little more routine when you are able (a certain time of day when you read stories for example, or a park day, ect.) The more he can know what to expect the easier the transition will be.
2.)Have consistent times that you always go to the potty whether he needs to or not. Once every hour if necessary.
3.) Describe your new state. Show pictures, read books about it. See if you can get a picture of your new home or apartment. Plan some fun things to see or do in your new area so he has something to look forward to about it (and you too!).
4.) If you can find stories a your library or something about moving or pottying, that can help too. My kids always seemed to identify with stories really well.
I don't know what to do about the talking over thing except to consistently correct it. But even with that my 6 you still does this a lot.