How to deal with the stress of DIY renovation?
Working on a house that you're already living in is a lot more stressful, because you're living in a construction zone.  Here are a few tips:


Select a part of the house to be construction-free. Your family can be comfortable in that space while other parts are in chaos.
Clean up at the end of each day. This will make the construction space less stressful.
Get help, so you can get the job done sooner, which means less stress. Sometimes that means hiring a crew to hang and tape drywall, much faster than I could do it. Sometimes it means hiring a handy acquaintance to work with me. 
Break the project down in to smaller pieces, so you can carry a subproject to completion before introducing new chaos. This isn't always doable, because of interdepenencies, but do it when you can.
Keep an eye on the well-being of your family and be ready to adjust your project expectations to care for their needs. Family is more important than house.
Get out of the house. A picnic together can help you reconnect. Send the spouse and kids to grandma's for a week while you get a lot of work done. And so on.