Yes, dear shimmerz, I know this and experience this smell too. Often, when I'm going through deep fear or anxiety, there's this sour or sourish smell. My dogs (of course) notice it too. Whilst the more gentle one of the two of them can't handle it well (he starts to softly whimper and walks away backwards, shaking his head), my cheeky one will sniff me all over, then he looks straight into my eyes with kind of a worried expression. Then he will sit on my crossed legs, start licking my arms and hands very intensely. And every now and then he will look into my eyes, as if to check if his "remedy" starts to work. Sorry, I went off topic...
I really hate this kind of smell, and the cause of it even more. On such days I use chlorophyll tablets, put quite a few candles in my shower and use a mild, natural baby-soap (containing babassu oil, sweet almond oil, coconut oil, calendula oil, and butter of: shea, mango, cocoa and is scented with essential oils of jasmine, lavender and oil of roses). I need to use a piece of soap to hold in my hands and feel it on my skin. Sometimes the fragrances of this kind of soaps seem to release all the stinky bullshit inside my soul. And this is so intense, that I have to cry heavily. But it's not the usual desperate crying; It's kind of purifying and liberating. It even feels consoling afterwards.
Not sure, if my writing makes sense today, though. Having a hard time expressing what I feel or think... Just ditch it, if not helpful.