Can’t orgasm or get horny anymore?

I’ve been married for over a year now and ever since we got married I haven’t been able to get horny or anything. I’ve tried everything and only made slight progress. I started birth control a month before I got married and I stopped 3 months later because I thought that was the problem but my sex drive still hasn’t come back 😕 my husband thinks maybe it’s a mental block? But I don’t know how to fix this. Before we got married I had absolutely no problems at all and I couldn’t keep my hands off him so this has been really frustrating and a bit depressing for me. I also just had a baby and am 3 weeks PP. Any advice or suggestions would be great