Can I Go on Strike?

I just need to sort through my thoughts. Bare with me.
Jed has asked me to start looking for a[nother] job. I have a part-time job, I do an aerobics class on my day off, and I am currently taking an online class as well. On the one hand, I do have quite a bit of time on my hands, but on the other hand, I am getting things done (losing weight and getting an education). We're trying to save for a house and I know that the extra income would be so helpful, but I am scared that if I get a full-time job it will become my whole life. Not literally, but I know myself and I foresee me being too tired in the evenings to work out and study. Sigh.
So that's the big thing on my mind right now.
I really love my aerobics class and would be really sad to give it up. The summer session starts at the beginning of June and I have to sign up soon, but I don't want to sign up, get a job, and lose my registration fee. Plus, it really motivates me to have a class to go to and the ladies in there are so nice.
I really like the job I have now - I love the mom and girl I work with and the schedule is ridiculously flexible. I don't know if I'm ready for a 9-5 job. That's a long day, every day. Then I also have to be so good about planning my food because I'll be away from home all day. I'm doing so well with my diet (not diet, just food intake) right now and I don't want to slip on that.
I don't even know where to start job hunting. The last two jobs I've had have been nannying and the three before that were through a staffing agency. I would just go to a staffing agency, but there aren't any good ones where I live, or else they rarely have jobs (I looked in to it when we first moved here). Also, because I've mostly worked through agencies, I am so rusty on my interview skills and my wardrobe would need a face lift. Ugh. I'm just dreading it.