And most importantly be patient with yourself. I was constantly focusing on being patient with our children when I forgot to be patient with myself, lol
I don't know if this will help at all, but I am a smaller frame about 5'3".... if I eat too much protein I bulk up, so I had to make sure I balanced it out with healthy carbs and not too much protein. Keep in mind the number on the scale is showing your new weight with full milking breasts :D It can play some tricks on you. Try just going off of how well your pants are fitting v/s looking at the scale. That sometimes helps initially when you are getting your body back into place.
I suggest you to wait a little more. I agree with seattlemom2plus. I think you don't have to panic and keep walking every day. This is a quite common problem. I think you should contact a diet consultant who can suggest you food which will not affect your breast feeding.
My one girlfriend recently had a baby and is breastfeeding for the first time in her life. She was complaining that she was not losing any weight come to find out she is hardly eating 1200 calories a day. Your body needs at least 1800-2200 (or more) calories per day and this is the intake for an exclusive breastfed child.
I agree that you should not restrict your calorie intake too much.
You might want to have your thyroid checked. Many women present with thyroid issues following the birth of a baby. Ask to have TSH, Free T3 and Free T4 tested.
Ugh I had this occur to me as well, the more I tried to lose the more my body seemed to gain. When I was eating like a champ I would seem to lose the weight. Your body makes sure it has enough fat for milk so it is normal to hold on to fat if you start restricting your caloric intake. How many calories are you consuming daily?