18M Am I loosing hair?

I'm stressed out a bit and could not sleep well. My hair used to be thicker than this and bit wavy, I use dove shampoo for head bath. Is this something temporary or a permanent change? and please lmk on my hair type and the products I have to use. And continuously for 4 to 5 days I haved skipped breakfast , Might be a helpful bit of info for diagnosis.