If you can't sustain that level of activity, and it is no longer enjoyable to you, then you do need to shift your thinking, I think.
You are doing a lot of exercise, but it is said that losing weight is actually mostly nutrition. Unless you are older, very short, or sit down for all of the rest of the day, 1500 calories a day may actually be too little for the level of activity you describe. In any case, the trick to losing weight is to create a SMALL regular deficit between what your body needs and what you eat OVER TIME. Large deficits work only in the short term, and can cause you to actually hold onto more weight over the long term.
I would do two things in your shoes. First, I'd start paying more attention to nutrition, making sure that your carb/fat/protein ratios are close to the 50/30/20 general recommendations.
Second, I would change up your exercise routines and try to figure out how to get more benefit in less time. Since you have a personal trainer, I might ask them about it. Then you could free up some time for other things & you won't feel like your only hobby is losing weight. (I'd keep the yoga class, though. I like yoga!)
You can do it!
My Sparkpage is set to private, but I'm open to SparkMail!
"People often say that motivation doesn't last. Well, neither does bathing--that's why we recommend it daily." - Zig Ziglar