I feel like my husband sabotages my weight loss efforts

Ugh. I had my 4th baby 5 months ago and I’ve only worked out twice. I’m seriously lacking motivation this time around. I have about 15 pounds to lose to fit in my clothes and it’s a bit depressing just wearing the same old sweats all the time. I refuse to buy new clothes because all my old ones are expensive and I know I’ll lose the weight. So he brings home in n out, and tries to make me eat it. If I eat something with him and I say I’m done he will be like you have to finish this or this and treats me like a child. I told him I wanted to get on a diet pill for the energy ...I’ve been on them before and they worked great. He told me he refuses to encourage me to lose weight unless I’m 400 pounds. Now I’m like 135 and normally weight 120. He refuses to let me join a gym and I have a treadmill in the garage but it’s freaking cold. I know it’s all excuses but I feel blah. Please be encouraging and nice ...because I don’t know what to do !