Often people come up with writer's block.
Sometimes it is genuine, but half the time it is a matter of having the commitment to sit down and put pen to paper.
Motion builds momentum, and sometimes it is all about starting to write something, and ideas will start flowing, sentences will follow one another and before you know it, you could write half a chapter in one sitting.
It is all about putting the head down and putting in the hard yards- whether you feel like it or not.
The other times, where it is a genuine mental thing, the first thing would be to make yourself feel good again, improve the self esteem. Because at the end of the day, writer's block is all about too much anxiety. If you can increase your self esteem, you can overcome your anxiety better. Affirmations are a good start and going back in your mind to the times where you had great personal victories always helps to remind yourself of how good you really are.
Secondly, do things that you do not normally do to stimulate other parts of the brain and to experience new sensations and emotions.
Thirdly, do things that you know will relax you, eg. meditate, message etc.
You can find more information on overcoming writer's block here:
10 tips for overcoming writer's block
Writer's Block
Here's some other web sites that may help you overcome the