I know what you mean. It's almost as though you feel a social responsibility to be sad. The same thing happened when my grandad died, I knew I should feel sad, but I just... didn't.
The physical manifestations could have just been the food, but it could be that you are sad, but don't quite know how to feel it, let alone express it. From what I gather, that's quite common for people with AS.
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Your Aspie score: 186 of 200
Your neurotypical (non-autistic) score: 22 of 200
You are very likely an Aspie
Apparently it's ethically incorrect to possess people...