I've become a gym rat too, it's a wonderful thing
The only thing I notice is that I get terribly sore knees if I do too much cardio - this is due to an old skiing accident, I get so "gung-ho" and never want to stop working out...but I have to be careful of my body and its limits. My routine is M-W: 45-60 minutes of cardio and stretch, then T-TH-Sat 45 minutes cardio, full weight-training routine, ab workout and stretch. I'm lucky to have a gym that is basically empty from 10am-noon most days. My daily reward is 15 minutes in the sauna. The only times I burn out is when I overdo the same cardio machines, like if I do the elliptical every day. The key for me is to change machines often.
I took up hula hooping at home when my knees got really bad, BOY, that is a workout! Try going over a minute lol! I still love the old Jane Fonda videos too, if you have the room
And on YouTube, I found some belly dancing workouts, those were kind of cool, made me feel very womanly lol... But I still prefer the gym.
Keep it up, be a proud gym rat!