Sudden Insecurity and Shame

This is related to physical and mental health, and I’m asking to figure out how to have a healthier lifestyle.

This has never happened to me before. Before I get into it, here are some things to note:

-I’ve been with my partner for almost 9 years, and he has always said such flattering and kind things about my body. He has never insulted my appearance.

-I had severe depression and anxiety for most of my life, but I have been doing so much better in the last year. I have been in therapy since I was 14, and I’m 26 and have a myriad of coping skills.

-Again, what I’m about to share has NEVER happened before.

So here it is. Yesterday my bf and I were home from work and about to do it, everything was normal and I was feeling great. He offers me a massage, and so I take off my top and feel STRUCK by how ugly and awful I must look. Factually I am 5’ 11’’ and 140 pounds, so I’m not overweight at all, and and I run about 3 miles a day and have had a healthy whole vegan diet for 3 years, and do yoga daily. I know I’m in good shape and I know my bf loves me. BUT, Emotionally, I feel fat, goofy, gross, and like a physical and insignificant joke. I started crying and pulled the blankets over me and my bf was so concerned and I couldn’t figure out why it was happening. I still don’t know why.

I cried for 20 minutes and my bf was just so patient and reassuring and held me. We sat together for a long while and I just felt totally stuck.

What the truck happened? I am 26 and been with the same loving man for about 9 years, and this has never happened before. Please help.