[QUOTE=~
So why do I keep obsessing and longing? It's driving me nuts. I have a healthy family, good friends, great job, more than anyone could ask for, and have never felt emotionally weak in my life. But life sucks... why?[/QUOTE]

Like you said you have an obsession. Can't turn off the thoughts even for a moment? It happened to me. What helps? Time and distance, is there any medication?, get daily exercise to release those endorphin's. Find ways to stay calm. Work on loving everything and everyone.

It took a long time for my thoughts to quiet down. I had dreams of crows circling overhead. One day the dream crows were dead on the ground. Symbolic of course.