Fixing a dishwasher that won't discharge may be simple. You can search for a clog or attempt to clean the strainer receptacle.
If your waste disposal is not functioning, you should turn it off and disconnect it from the electrical outlet. Then, examine the cavity for tiny objects and other impediments. Check to see if the circuit breaker has been tripped, reconnect the unit and attempt to operate the disposal again.
There are numerous causes for tap leaks, but corroded gaskets, valves and o-rings are the most common.
A sudden rise in your water bill indicates that you leak. Even if there is no visible leak, there may be a concealed one.