I'm not a doctor, but I thought I'd give a quick reply since I experienced a similar sudden change after years of repetitive bouts of depression.

After experiencing two MAJOR losses (my father's death at age 58 and a divorce), within a less than a year after the last of these events I suddenly felt like I was free and changed. I know that perhaps the opposite should have happened, since I had been a perpetually depressed person, but I believe this change happened due to the support I received from members of my church and work during my period of heavy burdens and an awakening within my faith (note I was already a Christian for many years, even before these events and yet suffered bouts of depression).

Let me explain it simply: I think that due to having a favorable work and social environment of which I was fully involved in both, enjoying support from friends and coworkers, plus developing an understanding that if I could (with God) overcome these events, together this all "snapped" me out of a perpetual cycle of depression.

Afterward, like you, I also felt new, changed and different than I was before; however I felt it in a positive manner. I know you're describing a similar "change" but with what seems like negative results (i.e., not being able to express love).

I bring up my experience to say that a break from your old self (if you were previously constantly or often depressed) is a good thing to take advantage of by exploring doing new things, with new or encouraging people, and gaining new confidence.

Also, don't trust in your "feelings". Today I feel up, tomorrow down, but with an accumulation of more "feel" good days than bad ones, you can train yourself to "feel" better and "feel" love, etc.

I hope this helps you in at least taking advantage of the "break" and exploring being a "new" positive you regardless of how you feel.

There is truth, whether you're a person who believes in God or not, in the saying that you are like those you hang around (I don't recall the exact quotation). So, find positive people, positive places and start doing positive things.

God bless you in your "new" beginning!