We live in an old house (150 years old) that was fully renovated a year ago. The tap in the kitchen sink has appeared to have air in it on & off for about 6 months, has sometimes stopped cold water running but has always righted itself in a few hours. However, it happened again yesterday, came back on a while later, but now we have had no cold water in the bathroom & the toilet won't flush since last night. I really can't afford a plumber at the minute so if anyone could help I'd really appreciate it!