hi Maggiemol
definitely, yes, separate out your 2 incomes, especially as you have a much higher income - sounds mercenary, I know, but YOU will need all the finance you can should your OH move into a care home, and the financial assessment on his care may well just assume that half of any monies in any joint account are his
and when you are paying household bills, make sure half comes from each of your then separate accounts - again, may sound petty, but otherwise you are effectively funding him and should you ever need care, that may have a knock on effect
I agree with lemonjuice, if it is at all possible, arrange for POAs for both finance & property and health & welfare - your OH needs to understand that you are doing these to have his permission to help him in future and agree to that AT THE TIME of signing, and you can get a long-standing friend to help, as long as the friend believes that your husband has sufficient capacity to grasp what he is doing at that moment - the forms are online - might be best to have 2 Attorneys to act jointly and severally, or at least have a named replacement to act should you not be able to - wouldn't be a bad idea to have these organised for you, too, just in case you are ever ill, so someone else has the authority to deal with your affairs
https://www.gov.uk/power-of-attorney/overview
if you think that your husband still has some capacity to let you know how he wants you to deal with his affairs, there's no need to contact the bank; that issue arises when your OH no longer has capacity, then you will need the POA or apply to become his Deputy
best wishes