awww Barb {hugs} the way you feel is perfectly normal for someone who is recovering from being unwell, is tired, and is also coping with looking after an elderly relative.
Sometimes in life, there are many days like this, when we feel the pressure getting to us, and crying is a great release valve when everything seems to get on top of us. You'll always miss your dad hun, there is no time limit to you feeling 'okay' after a certain amount of time after a loss hun. Sometimes certain times of the year, or events just trigger a memory, so just go with the flow hun, remmber your lovely dad with fondness and great memories.
You are probably reaching out for him, wishing he was here to take a wee bit pressure of you while you are feeling out of sorts, as I said its perfectly normal and very understandable.
It won't be long until your lovely holiday, focus on that today, lovely relaxing thoughts, time to unwind and concentrate on yourself and hubby.
Is your mum still in hospital hun? Could you limit your visiting time to a whole afternoon, or a whole evening visit..and allow the staff to take great care of her while you are not there?
Don't burn yourself out Barb, prioritise everything you need to do today and the following days, i hope you feel a bit better later..a good cry is recommended, so don't feel bad for needing to..it will help in the long term
if you've got the time, go and have a lovely long soak, lots of bubbles..have a wee cry if you need to, and clear your mind...then smile and take on the rest of the day...calmly and slowly
x