You have nothing to be sorry for, my Lovely. Except perhaps for not giving yourself enough credit, enough rest, enough space to breathe, and the same kindness, compassion and respect you would give others who would say the same things to you.
Be gentle with yourself and tell the rest of the world to take a long walk off a short pier!
The people who love you - your children included - will understand and be grateful for an opportunity to support you in self-care and good "role-modelling." Anyone who doesn't understand is not worth worrying about!
Sending you big, healing hugs and lots of love ❤️