Unlike child support, spousal support is often very difficult (if not impossible) to modify after the divorce is final, so getting it right the first time is a must!
You have been married for less than 3 years. Your chances of alimony beyond the divorce are slim.
On the bright side, nursing is a good field to get into. And in high demand in certain areas. I would check out if it is in high demand in your area. If it is, then you may be able to get a hospital to pay for most of your schooling. My cousin got $10k of her RN schooling paid for by a hospital. All she had to do was work there for a year.
It's something worth looking into. Maybe between a part-time job and tuition assistance if you can get it, you will be able to swing it.