Yes, this happens for me very frequently.
when I am in the aroused state, my preferences change a lot.
but when I come, it all becomes completely irrelevant and even disgusting sometimes.
It is not like I start disliking something I liked before, but more like I become more critical about details.
I heard that other people experience something similar as well, like when they are under stress they may turn heterosexual from bisexual and under even more stress they become asexual.

So yes, if you are experiencing stress it is totally natural to become asexual. When you will get in the good mood again your sexuality will come back as well.