How should i boost my confidence?

So earlier i was sexting with my boyfriend of two years and he sent me a nude, so I sent one back. Almost immediately after I ended up having a really bad panic attack because i was so insecure with how i look, despite the fact that he sees me naked all the time and weve had sex and done justabout everything. What can i do to boost my self confidence? i know im not particularly awful looking or fat, ive actually lost around 20 pounds recently but it seems that im even more insecure than i was before i lost the weight. I just dont know what to do, its gotten to the point where i considered starving myself again, which is how i lost the weight in the first place. Any advice?