Londonsick

My urban dictionary contribution:

Londonsick [luhn-duhn-sik]:

1. an emotional affliction

2. to be missing London while one is away

3. symptoms often associated with those of homesickness- but does not require one to have permanently resided in London

4. sometimes, but not always, a result of wanderlust

5. an incesant, inexplicable need to return to the the city on the Thames

6. pure. simple. sanity.