His name is Phil.

We've had him for almost a week. At the shelter he sat in my lap and we had a great time. Now that he's home I barely see him as he hides all the time. I'm afraid I may have taken on more than I can handle.

Hello Amaracudney and welcome to TCS!

No, you haven't taken on more than you can handle, honestly.  The poor boy probably did the same when he first found himself at the shelter; cats are territorial animals and it takes them some time to become acquainted with a new place.

When you first bring them home it's a good idea to keep them in a small space where then can feel safe, and begin their journey of discovery.  You can sit there with him.. I used to go in with a book and read, sometimes out loud so he would get used to my voice.  Don't push him into being affectionate.. it will evolve as he feels comfortable.

A Feliway diffuser or spray can help - it's feline pheromones and it can really help to settle cats in new places.

You've already been through most of this, but it describes the need for 'a sanctuary room':  [article="0"]Bringing Home A New Cat​[/article]  

I'm sure your boy will be just as affectionate as he was at the shelter.. it just takes time.

Yeah Mani has great advice. Kitty just needs a moment to get situated in his new home.

A Feliway diffuser is great. I use one everytime I move with my cats, and I move a lot. My one kitty Daisy sits under the bed for a week, but the diffuser seems to make that time shorter.

I agree he just needs time to feel comfortable. Don't force it let him come out on his terms when he is ready. 

So, beginning of 3rd week since we brought him home. He loves his food, poops in his box -But-he's only come out when we're not in the room and runs to his hiding place when either i or my husband go in. I wish he would come out, trying to be patient.