My ex left and took my daughter and step-daughter almost 2 and a half years ago. We didn't get along very well for the last 5-6 months we were together(6 years), so I knew it was coming, and I can't say she was my "best friend" any longer, though in the beginning she was...but...I was devestated by losing my family.
I spent a few weeks in a horrible funk...the deepest depression I have ever known, and entirely unable to pull myself out. I couldn't sleep, I couldn't eat, I didn't see my daughter for an entire 6 weeks...which threw me into a nervous breakdown. Now...I'm a strong guy...strong willed, strong minded, and I have ALWAYS relied on myself for everything...been on my own since 15 and I am now 34, so I am definitely not an emotional weakling, but not having my daughter was more weight than any human should be expected to bear.
When I started seeing my daughter regularly again, the deepest part of the depression was gone, but I still missed my family, and still desperately missed kissing my babies goodnight and good morning
[every day.
So I fished, and climbed, and hiked, and camped...I did everything that I wasn't able to do as a family man. I spoiled myself absolutely rotten with a new guitar, new fly rod, new climbing gear...everything I wanted, I bought. Everything I wanted to do, I did. I spent several months being a 17 year old kid with no real responsibilities again(of I continued to work). Spur of the moment trips out to the casino...Reno and Vegas are but short drives...weekends alone in the woods at elevation, alpine rock routes...whatever I wanted to do.
I did NOT find another girl. I didn't want to. I wanted to regain my own confidence and my own self-esteem before I was willing to try meeting someone else. Two reasons...I knew I was too jaded to treat another female properly, and I knew I was too emotionally scarred to protect myself from another "{evil woman"(no offense, ladies...I'm better now

).
It's been almost three years, and while I have had plenty of offers in the interim, I have only just recently met someone I am willing to invest more than a modicum of effort into knowing(she has snakes!!). But being single for this long has taught me that I am still as strong as I ever was, and I have regained some of my old confidence back...some of my self-reliance...that was lost when my ex left me.
I don't have any sage advice other than...do what YOU want to do. No matter how good a relationship is, and no matter how much you love someone and love being with someone...there are ALWAYS sacrifices. There are always things you want to do or buy that you can't because of the other obligations that come with a relationship. You don't have those obligations anymore. Spoil yourself rotten. Waste money, waste time, waste energy. It is ALL yours now, so do what you want to with it. It sounds petty, and it sounds juvenile, but darnit...it helps. It helps to renew your confidence and vigor for life. And it makes you feel good. You don't need another person for that. You don't need sleeping pills for that. It makes you feel good, and darnit...feeling good is good enough.
It passes. ALL time passes, good and bad. You'll get through it, eventually. Just take your time, heal yourself, and you'll get through it...
But do yourself a favor...don't fall for someone else right away. You are emotionally vulnerable, and ultimately, you will either get hurt again, or hurt someone else, and neither one is worth it. A little bit of fun never hurt anyone, but protect yourself emotionally and physically.