Can hair just start popping out?

I had a head massage done while I was in Sri Lanka on holiday. I came back home and after 4 days I noticed hairfall for the first time. After that, my hair has been falling a lot all of a sudden. I feel itchy and tingly on my scalp, and can feel a plucking feeling then hair falls out. Got all tests done including thyroid function. All normal. This has happened to me for the first time and I'm freaking out!! Since the last 2 weeks it has fallen a lot and some patches are now visible. Pls help!