Back Exercises

I'm looking for some help, as must lose some more weight.  I have lost 4 pounds, but need to lose the other 11 pounds.  My doctor says this is a great direction I'm taking for my back problems.  I am hoping people can give me back exercise suggestions, as my back has been hurting a lot this month.

I have taken back pain medication more times this month than usual.  Today I started the day with medication.  My doctor told me to use lighter weights, so I bought an entire weight set, so can use the littlest weights.  He told me not to use them every day, so I am doing more walking.  I'm taking a day off from each type of exercise.  Other exercises I'm doing sit-ups and jumping jakes.  I have ordered a new jump rope, as can't find my old one.

Any suggestions for weight loss appreciated, as I gained 10 of the pounds over the holidays.  I know its all of the food, cooking, baking, high calorie foods, and stress that I need to solve before the next holidays.