OCD thoughts because of food?

I’m not sure if it can be called OCD but pretty much feels like obsessive way to much. Tiring much. Every time I eat something “bad” even some small sweet snack (chocolate, tiny slice of cake, cookie, whatever) after “good” healthy food my mind drives me crazy. Ill be sitting in front of a film without consciously processing a single frame but just thinking something like “ok, it’s just a little bit, my stomach is flat, I’m still skinny, but I feel like my stomach is much bigger, my legs are getting bigger and wider, my second chin is growing faster it’s almost visible and etc” and I’m literally pulling up my stomach which takes away my breath and I notice I’m not breathing but my mind just won’t stop. What is wrong with me? Even if I understand and I’m aware of it happening, I still can’t manage it. I’m trying to remind myself that I’m totally fine, I do yoga, activities, I go for runs (unfortunately not in winter and it makes me feel even more disgusting), but I still try to stick to healthy food most of the times. However, I’m a big sweet tooth and can’t resist eating a bit of sweet every day. The only time I don’t crave sugar is only when I’m totally stressed but those periods were horrible so I would just like to stay healthy and skinny meanwhile I’m living life without stress. Has somebody ever dealt with something like this? I’m getting so tired of this. I would love to not eat at all and just charge myself with some sunshine…