I remember hearing an interview on the radio with a famous writer (Frederick Forsyth I think) who said he did not believe in writer's block. He said "You don't hear of nurses getting nurses' block, do you? Or mechanics getting mechanics' block. It's the same for writers. You just sit down at your desk and start writing."
The other one I heard about was Mickey Spillane's account of what kept him writing: Money.
He said his books were doing pretty well, and so he kicked back and relaxed, stopped writing and spent his days sitting by the pool and drinking. One day his accountant turned up at his house and told him his finances were beginning to look in pretty bad shape. He started writing again straight away.
I think it's the hardest of all for those of us who write in our spare time, after a hard day at work, and then an evening putting the children to bed and doing the chores around the house. It can get very dispiriting at times under those conditions, especially those of us working on a novel without guarantee of getting it published.
Not much advice there I'm afraid, just a few ramblings.
I'll try and be a bit more helpful next time.
Regards,
Ken