I played for 6 months without being profitable and then it took another 4 for me to start making money that looked like profit.
It was only 'pocket money' but if you are profitable i suggest you carry on but take a few weeks off then come back do some good studying of the game and most importnatly YOUR game (this worked for me) and then start again. Try to start afresh menatlly if possible. Hopefully this will help. It sounds to me as if you have turned negative mentally to the game at the moment because you feel you arent making stacks of money. Maybe you can only make a suplementary amount per week, but thats money you didnt have before isnt it?!