You should be fertilizing all year long for Cyms., just a more dilute solution during the cold months. Although there are numerous products on the market, I recommend the MSU formula (Michigan State University). I know that it can be ordered from First Ray's Orchids (Ray) who often participates on this forum. Just do a little searching for his information. As with all fertilizers, use a dilute solution weekly, or as we like to say "weakly/weekly". Some flush with straight water after the third or fourth fertilizing.
Even though you have new growths and a spike, the shriveling of the green bulbs is a sign of severe stress. One sign of a deteriorating plant is if the most recently matured green bulbs are smaller than the previous ones. The mature bulbs always should be larger than the year before to a point of optimum size for the cross.
I suspect you will find when you get into the plant that there will be a lot of old rotten roots off the leafless BBs causing the media to remain too moist. After three years under your care and who knows how long in the same pot before you got it, it is definitely time to repot after it is through blooming this year and when the weather starts to warm up.
Good Luck,
CL
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chidlove 
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