Here’s the kicker … people will continue to take while you continue to give. Just stop. If your son is off sick, he needs to get himself to appointments or ask a friend or another family member. If your daughter needs help, she needs to seek out more professional help or find a helpline or someone else to confide in. If your mother is taking care of your father, leave her to do that, if she has health issues, she needs to discuss these with her doctor.
Sit down with everyone (including your husband) and tell them that you are spreading yourself too thinly and you are stressed and can’t do it anymore. They need to step up and help in some capacity or stop relying on you.
As they say on an aircraft, ‘Put your own mask on before you try to help anyone else’