Why is my espresso weak AFTER thorough descaling?

My actual model is DeLonghi Bar 41 pump driven espresso/capuccino machine, but could not find this model as a menu option. I recently did a thorough descaling and cleaned the boiler outlet as described in the manual. For descaling, I ran about a half cup of solution through the macjine, paused about 15 min, then repeated about 5 times before running the remaining solution through the machine. After doing this, the espresso is coming out very quickly, tastes weak, and has little or no crema. I'm using the same coffee, same amount, tamping exactly the same way. Is it possible my descaling damaged the machine? Any ideas about what to do next?