My name is ***** ***** I will try and help you today.
I am sorry you are experiencing this problem.
As a joint owner you have equal rights to remain in the property.
Obviously, it is complicated to allow your son back into the property if your husband is there and does not want him there.
Ultimately, you could go to court to force the issue.
As the resident owner your husband is liable for the Council Tax from the date you vacated.
Make sure the council are aware as you will need to pay wherever you are living and do not want double liability.
Get confirmation from them in writing that you have vacated.
The only way you will be liable for council tax going forward is if you a) move back to the property or b) your husband also vacates - you'd then be jointly liable until the property is re-occupied.
The same applies to the gas and electricity as you are not using the premises.