Just need advice...

Robyn • I am a single mom of 3 kids. Divorced.
I have two kids. One went to heaven just before her 2 month birthday due to an undetected congenital heart defect. Ever since then I have struggled with my weight and have gone into a deep depression. I work out, eat healthy but I cannot lose any weight. When I had my first I lost 50 lbs and was at my lightest of 185lbs. I am 5'8". I gained a lot of weight with my second. I haven't lost a single pound since she died which was 17 months ago. I struggle with the way I look and feel even though I am trying. I am a busy stay at home mom but get to the gym 2-4 times depending on my week. I have completely lost not interest in sex, but it doesn't feel good anymore. I don't enjoy it anymore and end up crying after with my husband just not knowing what to do. It's frustrating because we want more kids and it's definitely hindering everything. Any advice is greatly appreciated. Please no fat shaming. I already feel bad enough as it is