Hello sad sam,
Welcome to Psych Central!
No, it doesn't sound really stupid.
It sounds like you are understandably worried about your Nan.
Try to set some time aside where you do something nice just for you.
Make sure you get plenty of rest and practice relaxation.
It might be worth a trip to the doctors, so that he can reassure you.
You are important. Take care of you.
__________________
Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein