I hope Binky is doing well.
I lost my beloved Cookie this year to lymphoma. She had IBD and PLN (lymphangectasia) since 2011; so, they can respond and do well! Here is a link to a thread about her...and in that link there is a link to her original thread:
http://www.yorkietalk.com/forums/sic...ia-update.html
Usually it is best to have them seen right away when you see them slipping back because this is an illness that can really take over quickly and they can be difficult to save if it gets to a point that they are getting fluids in their bellies. You don't realize it until it is too later. So, my thoughts are, when in doubt, call a vet!
Sure hope things are going well....