After I gave birth to my son 5 and a half months ago I was feeling confident because I was losing…

After I gave birth to my son 5 and a half months ago I was feeling confident because I was losing weight very quickly. Well today I got weighed and I'm not so confident anymore when I gave birth to my son I was weighing in at 190. Before I even became pregnant with my son I was weighing 135 and I weigh I70 and am so disappointed of my self I worked hard to lose the weight just to regain it! Can anyone help on suggestions to lose my weight I did have a c section and not sure of what exercises I can do.