(((((((Natalie)))))))
Yes a toddler and newborn are hard work I too have found. I really have no idea how people with more or multiples do it. I don't know from experience but believe that it can only get better. My midwife who has the same age gap as me between 2 of hers said the 1st year is really hard but after that you really reap the rewards.
Is there a place over there that does nappies in bulk and delivers to your door? Maybe you could try the eco nappies. I buy all mine nappies this way as its so much easier and cheaper than from the shops. But I had forgotten how much washing a new baby makes.
One thing I found with Adam when I was expressing and giving formula was the changing upset him. He's been much better now he's only on formula. I'm not pushing ff, its just works best in our family.
Do you have family or friends that could maybe take Beth. My Beth went to her grandparents for a couple of weekends and they did some 'special' things with her which really helped.
You will get there, I promise.