New to this but need help 😩

Umm don’t know how to start this because I’ve never asked other people for help so....

I’m 20& my husband is 26, we’ve been together for a year now and I don’t know how to get back his interest. When we dated, we would have sex like 4 times in an hour, eventually it slowed down. Now it’s like we have sex every couple days because I was so tired due to my medical conditions. Yesterday was the first time we had sex in three weeks and he barely even touched me.... has anyone experienced this with their SO ?? I found pictures of his ex when we first started dating and she was wearing like stocking and heels and all that. But I’m not comfortable in my body because my stomach is chunky. And he hasn’t ever told me what he likes in the bedroom. Any advice is much appreciated ❤️❤️😩