Hey Kath
Sounds like you are in a bit of a rut, what ages are your children? I think esp when you are tired and not getting enough sleep it can be hard to get motivated. And on school hols even more so. Sounds like your DH isn't home much either which means you are not getting adult conversation, and that can make you a little stir crazy I reckon.
If you have had depression before you may recognise some of the symptoms. How about setting yourself a goal and writing it down and aiming for it. Say for example to start with something small, getting up and having a shower first thing and getting dressed. I know that the longer I am in PJs the less likely I am to feel like doing anything. If I get up and get showered and dressed I feel more awake and ready to start the day. You also need to recognise that your bub is only 4mths old and so probably still not fully settled, try not to worry too much about not being organised, babies are time consuming and hard work not to mention lots of fun. Make sure you enjoy your bub. Being a mum of a large family is tough, and although we wish we were supermum we are not, so try to not stress and maybe once school goes back you can get into a routine which makes you feel a little more in control. I know I feel crazy on school hols, house is trashed no matter how much cleaning I do. My kids are 12, 8, 4 and 2.
Hugs to you
Michelle