If I could send you a speedy new Apple laptop, I would. Nothing is more frustrating than an old, slow computer. (oh wait--probably a WAS in MLC is more frustrating!)
I'm glad you got the sisters over to help pack. It is easier with others around.
Of course you will notice when his car is there/not there. Not being any expert on detachment, I guess the idea is to be able to feel: "Car not there? OK. " And not spin off on what it means/doesn't mean.
Did you solve the puppy problem? Will s/he go with you to your brother's?
When do you move to your brother's? I really hope that the change of environment will help you move along to the next phase. I understand that it won't be the ideal living situation, but hopefully "different" will equal "better".