Is my Dendrobium dying?

[sohara]

I received a Dendrobium as a gift and since then it has been steadily declining. It has 2 stems and lost all of the flowers on one and all but 2 on the other. The remaining 2 are wilted and will probably drop off soon. The leaves are dark green but a little droopy. In the last day, the stem with the remaining flowers has begun to turn brown starting with the tip.

I have been watering it weekly, and allowing it to dry between waterings. At one point it might have been getting a bit too much light - close to the windowsill on a north facing window. At the moment it is getting indirect light from a north facing window.

I'm an orchid newbie and I don't know if I'm doing something wrong. I hope that someone can offer some advice to help me save this plant.

Thanks!
-Shana