Genuine sorrow hurts, but my god if it isn't a fascinating and powerful state. It's 100% transformative, in a good way, if you allow it to be. Sorrow and the journey back, imo, is a vital trial in human development, all the more interesting because it's truly universal. The risk is so hardening yourself against pain that it's detrimental, the prize is a deeper capacity for empathy.

To love, and to lose, and to find your way back to love again - it doesn't feel this way in the slough of despond*, but on the other end and with some time it's a beautiful thing.

(*General statement - if you want to think more on this whole transformative experience thing in general, you could do worse than reading The Pilgrim's Progress by John Bunyan. If you're vehemently anti-Christian you'll need to replace Yahweh, Sky Wizard (tm) with your own conceptions, but the allegory itself still provides some palatable food for thought)