That's really a tough one - there isn't a canned answer that works for everyone.
What has worked for me is to eliminate everything that you can, and try to spend as much time just relaxing as possible - watching TV, gardening, woodwork, reading (NOT IT related), whatever is plain relaxation for you. For me, the more time I can just relax, the faster I can recover. However, job/family still have requirements, which will stretch things out. If you're involved in extra activities, see how much of that you can dial down. All of the responsibilities from those will add to the overwhelmed feelings.
Also, keep in mind that everyone "recovers" from it in their own time. The last time I had a major burn out phase, it took over 6 months. It also takes help from your family - not so much "leave daddy alone" as it is just "daddy needs to rest/relax", and for them to help you relax.
I'd also recommend that you look back at how you started recognizing this... and then keep a careful eye on this in the future to be able to recognize early on if you're starting to go down again . For me, it seems to crop up every so often, and it's a lot easier to dial down a few areas gently to avoid this than it is to have to make major changes to those areas.
One last thing... being burned out/overwhelmed is not too far removed from depression. Don't be afraid to seek out professional help. You may not recognize it, so you may need to ask key people in your life (spouse, close friends) about it and whether they've noticed any changes in you.