Hiya Caraline,
My hair's gone very thin too. I mentioned it at my post surgery appointment and Mr Small said that about 20% of people after surgery get this. It's to do with the anaesthetic - I've also got ridges on my nails, because your body just focuses on keeping you alive so everything else shuts down, apparently. It's called telogen effluvium if you google it it describes my hair loss to a tee. I've now got a short bob because the whole bottom layer of my hair fell out!!!
I hear you're looking fab, sorry I missed you at Halloween, maybe we can have a festive catch up - can't believe it's almost 6 months since our ops! x