Hi Spinsr,
As your starting to experience, being an affiliate is 'hard work'.
Like anything, unless it's fuel by passion; a love for doing something, the motivation will dry up.
When I started many, many years ago (granted was a full time affiliate), for the 1'st 6 months, I worked for literally days, weeks and months on end. Over that time I alloted 1 weekend a month as rest. The rest was 7 days a week. Work 14 - 16 hours, eat; sleep; shower, then repeat the process. Unless your driven by a burning passion to succeed, then sadly you will fail every time.
Like yourself, I too was committed to producing quality content. Because of this it tends to wear you out quicker. I found keeping a pad and pen beside my bed, or in the kitchen/lounge room helpful. Anytime I had a thought/idea about an article etc, I'd jot that idea down, and later use it.
One important factor though in seeing this through (aside from the passion), is you need to set small-goals.
Looking at other people's sites and thinking... man, they have 30, 50, 60 reviews, how the hell can I do all that work. Thinking like that will create negative thoughts, and that's a bad head-space to be in. Instead, remind yourself that they too were once where you are now - starting out as a newbie affiliate. Try to keep that perspective in mind always. EG - Roman wasn't built in a day
Over and above all of that, take time out. Reward yourself for achieving your goals.
It's possible to become a successful casino affiliate, it just takes passion, and to never, ever doubt what your doing!
Also... invest in a whiteboard if you don't have one already. These are great for adding daily tasks, your mini goals etc
P.S... If your married, or have g/f etc, spend some quality time with them, away from your affiliate stuff. When I started this gig, I'd spend next to no time with my g/f. As a result that relationship ended.