Are your Care workers from an agency or have you employed them yourself?
The ones we have are agency based and there is a lose leaf binder which gives all the details concerning my OH and what his conditions are, and what is required to be done, and what needs to be looked out for ( infections etc), along with a list of his medications.
There are forms for each week with tick boxes that the carer has to fill in along with observations - and the carer has to sign to say they have completed all tasks.
We find these work very well. Whilst the binder belongs to the agency, I can also check what the situation is on any given date.
If you are with an agency, I suggest you ask why there is no record like this - if you have employed them, perhaps you could set up a binder for yourself - it shouldn't be difficult, and it would be how you wanted it to be.