Overwhelmed

Welcome @ChristyT.  Overwhelmed and drowning is a very good way of putting it.  It is overwhelming and at times you will feel that it is never ending.  I was diagnosed this time last year and finished active treatment at the beginning of September (I think) and most of that time I felt that I was in a tunnel.  This forum is a really good place to come for the support from people who get it - you can let the mask slip, here.  For many of us, it has been important to let go of trying to be the person who does everything and let others take it over.  Having young children adds a different dimension to it (mine are a little older and so could help more) - make sure when you have offers of help from people that you have real things for them to do as it's not really helpful to have 5 spag bols in the fridge when your bathroom is growing and you can't get out of bed to get the kids to school.  Being able to relinquish that feeling that you need to be on top of things is one less emotional drain on you.  I would also suggest that if you can, find an oncology rehab programme (preferably bc) as exercise will help with both the physical impact and the mental.  You don't say where you are located - other members could help with this if we know the general area you are in.
There's nothing easy about this - it's just a matter of getting through and it does feel like it will never happen but it will.  Every chemo treatment is one less that you have to have.  Rads is not difficult and there are ways to help prevent burns.  And not everyone has issues with the hormone therapy - try not to go there in your head until you have to.
But do come here for info, support and the odd laugh.  It helps.