I think this was such a good thing to post. Not only because I'm a caregiver but because I've worked with so many caregivers.
What I see(and sometimes feel) over and over is that the caregiver often feels they have no "right" to complain, to be sad, to vent, to get frustrated, angry,etc. After all, whatever they are going through is not as bad as the person they are caring for.
But it is so important to remember that you are going through something and it is so important to get your own support network going.