Hi Juel,
It sounds as if Honey as an autoimmune disease which cocker spaniels as a breed are predisposed to.
My oldest cocker Jodie had a form of this called Auto Immune Haemolytic Aneamia about 3 years ago when we were moving house. I believe it was the stress of moving that brought it on.
Although she was very ill and had to take steroids for several months she is fine now. I do have a lot of info about auto immune problems and if you would like help then please send me an email privately.
I hope and pray that your Honey will pull through - there is light at the end of the tunnel.
Sorry to hear about your other cocker dying so young - how very tragic that must have been and I expect it is at the back of your mind at the moment.
Be positive and try to be strong.