I really did try to identify this plant, but I certainly could have missed it in the pictures of trees.
The plant below has been around my house for a very long time, about 18 months..
This plant has a thick brownish trunk,with long thorns. About three weeks ago, it began to bloom tiny flowers in various shades of pink, all with a teeny green stripes on the edges. Strange thing is, the flowers seen to be layered, with the pink ones growing right out of the green flowers.below
And now it is sick. It has lost it's leaves in the middle (leaves turned yellow before falling off), and now quite a few leaves have tiny green spots on them. They are not black, or brown, but really do appear green.There are no moving insects.,or white spots.
Can someone please help me identify this plant, and tell me what to do about the yellow leaves that are falling off?
I apologize for the length of this post. I'm not good with short sentences.
Thank you.

It's a crown of thorns plant,and you should really ask that in a houseplant gardening website