Don't be upset or worry!
Just learn it step by step.
You'll become independent when the time comes.
When my late husband was still alive, I didn't know how to take care of myself either.
He took good care of me and did all the housework himself, including purchasing of household stuff and cooking.
I only began to become independent when he was suffered from cancer. Then it was my turn to take care of him.....
Don't push yourself too hard. I believe your husband will understand you and won't expect you to be very independent, nor even take care of him!