Hi Ms Cat, yes there will be bad days, but if you didn't have them you wouldn't appreciate the good days in between.
Take all the advice given by others about the RE. They are the ones responsible for losing it, so it is there responsibility (duty of care) to hurry up and find it. Sometimes RE can be slack - not saying all are, but I have found in a few dealings with them, that they often think more about their commission than their clients, and that includes owners and the person renting. If you need to give them a copy - get one and maybe a good idea to fill out a Stat Dec, signed by a JP, and explain that it is not a copy of the original because the RE lost it, but it is a copy of the copy you were given - hope that makes sense. It is not your responsibility to get EX to sign another one - it is certainly not in your best interest to do so, and could be risky - who knows what state he might be in right now.
About you being a rescuer - I have a DD who is definitely one. 1st Marriage very abusive, emotionally, spiritually and physically - 2nd marriage is not exactly the same but still abusive in lots of ways - breaks my heart. There are some good books around about co-dependency, and also Boundaries. There is a book on Boundaries in Marriage (which is helpful in all sorts of relationships), which is written by 2 Christian guys, Henry Cloud & John Townsend. There first book is Boundaries, but I think the marriage one is a bit easier to read. It makes a lot of sense, and I'm sure it wouldn't compromise your Buddhist faith, another great book, also written by a Christian is called Tough Love - author James Dobson, also about marriage but very helpful for all sorts of relationships. He has been criticised by some Christian for writing it, because he doesn't go along with
"Marriage is forever" bit, but is very balanced. A good one on Co-dependency is "Co-Dependent No More" (I think) but can't remember the author. I read them all when going through my marriage crisis and they really helped. I also read a few humourous books written by women who found themselves in various circumstances. I became a "Relationship Book Reader and Seminar Attendee Junkie" :^O Even bought myself a leather briefcase, which my kids thought was rather funny. It all helped though, along with the support of my friends and lots of prayer.
I continue to pray for you and try to imagine how you must be feeling at different times. Also praying for you other ladies going through similar situations, and others struggling with variious issues.
So good to have the support of all the lovely ladies on here with their empathy and practical advice.