I brewed and Irish draught ale from NB and fermented for 10 days. On day 7 the fermentation stopped and I let the temp rise from 68 F to 72 F over 20 hours. I then primed with muntons kreamy x. Let carbonate at room temp about 72 f for five days. Opened a bottle and it gushed like crazy! I put one case in a mini fridge and the other left in the box in a shower stall with closed door. WTF!? HELP!
I can't really give you a definite answer without more info. Did you take OG and FG readings? What yeast did you use? Did you use the appropriate amount of Kreamy X? Did you chill the bottle that gushed?
Your hydrometer readings are key here. Even though it "looked" like fermentation had stopped, the yeast continue working. It's possible that you didn't reach your targeted final gravity yet and had too much yeast remaining in solution. Even if you did reach your target, you may have bottled before enough of the yeast flocculated.
The bottles in the mini-fridge might be okay, but be sure you open them over the sink immediately after removing from the fridge. If they are over-carbonated and have a chance to warm up, you're f...ed.