Suggest the cheapest possible day for an easyjet/ryanair flight in September (I don't think you can wait till Jan).
DH and I once ran away on a day's notice from Stansted to Pisa. 3 days with a view of the tower with that colour and ambience and liveliness and street food and the problems seemed so far away. We coped much better on our return.
Maybe avoid Maldives-style beach holiday or anywhere where you lie on a beach and have too much time to think.
If you must wait till Jan. that's good for Venice I think.