My  sweet Creature, my faithful companion of more than 18 years, aka 'the  reading kitty', left her body a week ago. She loved nothing more than  literally being on me, sitting in my lap while I did client sessions (An  animal communicator once told me that Creature thought she was getting a  healing each time.) She was fine till two days before she checked out  (the vet gave her an AOK about 3 weeks previously), then suddenly had a  hard time walking and finally didn't want water. I knew the end was  near, and she breathed her last while in my arm, immediately after a  reading. [If you're reading this on Facebook, many thanks for your  thoughts, stories and prayers. I'm not rehashing old ground, rather, I'm  sharing what I've learned from the experience.]
The  experience got me thinking about the human experience of loss, what  makes it so difficult and how to make it easier. I see four  issues/remedies. The first two are for just about any loss of a  person/relationship -- a romantic or marriage breakup,  a child going  off to college, going into the military or just moving out, the ending  of a friendship due to betrayal, and of course, your garden variety  'death', that is, one of sickness or old age, or even accident. [Murders  feel very different -- trust me, one of my friends was murdered a while  back.] The second two really relate only to 'death'. 
Issue 1 - Cords:   When you have an intense and/or long-term relationship with someone,  your energy bodies (that is, the electromagnetic fields we all have)  create electromagnetic connections with each other. These are  called  'cords' because they literally look like cords of energy between the two  of you. This is why we say things like "my heart goes out to you" -- we  have created an energy cord between our hearts. When one of you drops  your physical body, or ends the relationship abruptly (even if it's  planned), the cords, and their connections to your energy body are  abruptly torn, leaving holes in your energy field. This is generally  interpreted as emotional pain, though in truth, it's quasi-physical (one of the layers of the electromagentic body is emotional).  This will usually heal in time, because bodies do know how to heal themselves.  You can also intentionally heal the holes through visualization (call  me at 888-4-hollis if you want help).
Issue 2 - Triggers:  When you see your pet's favorite chair -- now empty, or hear 'our  song', or catch the waft of a familiar cologne on the breeze, or taste  Grandma's madeleine,  it can trigger a strong memory of the relationship  you used to have. What you do with that memory, how you compare it to  what exists in the present, and how often you access that comparison  affects your experience of the loss. If you only compare what was (which  you liked) to what is -- and label that change 'missing', you are  probably going to be miserable. One really simple solution to this: if  you are constantly experiencing  the comparison, and finding it  unpleasant, just 'Be here  now" -- focus your attention in the present. 
Since  memories are carried holographically in our energy field, you can  change them. What you do is  change yourself, your energy field, to  match what is, not what was.  (Again, call me at 888-4-hollis if you  want help, because there are specific NLP ways to deal with triggers). 
Issue 3 - Beliefs:  Many people have the mistaken notion that mourning, feeling bad,  somehow honors the dead. Nothing could be further from the truth. Why  would someone you love want you to suffer? This is the experience of one  of my clients, who is also a medium. He says he's had multiple  encounters with those on the other side, who say, 'please tell my loved  on to move on -- I want him/her to be happy.'
If you  truly believe your loved one is in a better place,  then you should be  happy for him/her -- and the only person you are feeling bad for is you.  And you can change that -- see (1) and (2) above. 
Issue 4 - Transcommunication:   Which brings us to communication with the other side. Yesterday, I 'got'  that Creature wanted to show me how much she loved me, and I could feel  her little paws on my thighs as I sat. Now that I know she's fine, I'm  fine. So do your best to communicate across the veil, and if you need  help to do it, get help.