Quoting kevinlost: But how do I keep the positives going so that the doubts go away. How do we rekindle our love and passion?
Keeping the positives going is a matter of when you find the 180's that work, do more of them. Only by continuing to make the changes consistant over time, so they become second nature, will those doubts disappear. So it will take plenty of time. Its the only way. A good way of keeping the positive going is asking yourself each morning, "What can I do today to make it a better day than yesterday?"
Same goes for the second part of your question. Try to bring back more of the upbeat, fun, light-hearted moments spent together. "Continue to ask yourself, is what I'm doing going to bring us closer or push her further away?" Concentrate more on maintaining an attitude of being a friend, even a date, rather than a spouse.
There will still be times where she will need some space. Watch for the signs and back off when needed and keep the focus on working on yourself and what you enjoy.