Saving a Tree: I need your help!!

Last year. I didn't celebrate Christmas. I didn't buy a tree. I didn't put up decorations. I didn't even put up lights. You see. Last year, I was going through a separation / divorce. I was depressed. And I didn't feel like celebrating. But this year. I am in a better place. I am newly divorced. I moved to a new apartment. I have a new job. And a new life. And, to my surprise. I am much, much happier than I was a year ago. In my new neighborhood, there are street stands everywhere selling cut Christmas trees. Since I did not celebrate Christmas last year, I really wanted a tree this year. Nothing feels more like Christmas to me than the smell of fresh evergreen in my house. However, now I live in a small 1 bedroom apartment, with room for only a small tree. I stopped by the tree stand a block from my place and asked the sales guy how much the 3 foot tree was. $45 bucks he said. "Forty-five!!, Are you serious?" I yelped! I balked at the price and decided not to buy a tree. In my mind, I refuse to pay that kind of money for a dead tree. I'll save my money and the tree.

If you do buy a Christmas tree in Manhattan / boroughs, the city Parks department again is doing a Mulchfest after the holidays. On January 12th and 13th 2013, trees are collected and mulched and used in gardens and parks throughout the city. So, drop off your holiday tree to a participating park in your neighborhood. Check out the details here.

I was a little bummed about not getting a Christmas tree, but then my friend gave me the best idea. He said, "why don't you decorate your lime tree?" LOL. So that's exactly what I did. Well, I didn't do that much decorating, I hung a few ornaments on the tree to liven it up. It makes me smile every time I look at it.

But... I noticed this week that the leaves have been falling off my tree at a very rapid rate. Every day, it looses 2 or 3 leaves. Is this normal? Should I be worried? There are 6 branches now with no leaves on it. I am sooo beyond worried. I've had this tree for over 4 years, and it's grown so much since I first got it. I don't know what to do to help rescue it. Any advice would be so appreciated. Please help me save my tree. I'm thinking maybe it's not getting enough sunlight? This window faces the back of the building so it doesn't get sun but indirect bright light. Also, on the left where that tall pipe is, it's a standing heat pipe. Old buildings have heat like this. Help. I need your help. Do you have a citrus tree indoors? What should I do?