S1 FORM AND MEDICAL CARE

Hello all,
We have taken early retirement my husband is 60 I am 54.
I have an S1 medical form am on pip and disability benefit. We would like to take up spanish residency but the more we look into it the more confusing it gets. Currently what is the situation regarding the S1 health form and what does it actually entitle me to? Do I get help with my prescription costs? Also would my husband on the back of my card? Obviously post Brexit is another can of worms.
All help gratefully received
J👋

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