To much on to little calories

Tonight at weightlifting I could barely finish my workout. I'm exhausted. After doing minimal training the last year I jumped full throttle back into weightlifting 3 nights a week, CrossFit 3 nights a week, and calorie restriction. I'm trying to do to much, to soon, with not enough calories. Tonight I'm getting a full 9 hours sleep. Tomorrow I'll increase my calories and do less weight at CrossFit. I got much to excited about getting down to the 105k weight class. I need to slow down my weight loss and take care of my body. I'm not as young as I used to be. My body isn't nearly as able to tolerate the abuse it used to.