I'm going to take a stab at this. I'm not sure what Eurozone context is...
Sclerosis is a disease. The calcifying or hardening of something. Malaise is a general lack of spunk, vigor, a depression, feeling out of sorts. For Europe, the patient diagnosed with a fatal disease, the prognosis wasn't good. Instead the patient healed and prevailed.
According to what you've posted here, against predictions of doom and gloom, a continent with no hope, diseased and tired, Europe was not only able to overcome these hurdles and but was able to surpass them.