Help!!!!

I want to lose weight since the beginning of the year I have lost six pounds. Went from 204 to 198. I bought some diet pills online and in 3 days have lost 3 pounds. I just asked my husband to go walking with me and he said no. He wasn't part of losing weight. I want to get back to the size that I was this time last year. I was a size 7. Now I am a 13 or 15. What do I do how do I get him to work out with me? Its just walking. I'm so worried. I want to get back in shape and if he doesn't go with me how will I do it since I have no license to go to the track and live by main roads? Here are some photos. Pic one is my diet pills. Pic two is how I look now. Pic three is how big I was. Anything will help ladies.