Heya Used2Be,
Your weekend sounds tough! It's normal to feel fed up, and after going through this for some time, I think it's natural to feel like this. It seems like for quite some time your feelings have pushed aside so that you can focus on caring for you dh. Thing is though, pushing them away doesn't resolve them, those feelings can linger, and they can build up and bubble away below the surface. Eventually, things can add up so that they spill and boil over - it can feel like you're having a 'meltdown'. It's important to recognise these feelings, and give yourself some space to go through the motions.
You are human. None of us are superhuman. We all have emotions. Carers often feel sad, angry, hurt and resentful at times, and then they can feel guilty and selfish for feeling this way. These are all normal emotions, it does not mean your selfish, it means that you also need to take care of YOU.
Give yourself some space to let it go.
Take care,
CB