I just wanted to let you know that I really understand where you are coming from, the feeling stuck part and not feeling appreciated or compensated for your experience and dedication.
I work in an office as a secretary right now and I went through a similar thing a few months ago with my "review". I got reprimended not once, not twice, but 3 times for missing the very last two days of the year because myself and hubby both came down with the 48 stomach flu and I didn't have any sick or vacation time to use because, you have to use it all up by the end of the year or you loose it. I didn't even get paid for those two days and they still got their panties in a tizzy.
I have been feeling better about everything and being stuck here to pay for nursing school since I found out that I'll start clinicals this Fall. I think, that if you really feel that things won't get better and that you should move on to other opportunities you'll start to feel better about everything. Once you start progressing towards a new goal, like you have been with your job search
I think everything will look a lot brighter. Even if you do end up staying at your current job for a couple more months so that you have the time to visit your grandbaby, just knowing that you have other options will put things in a new light for you.
At least that is what has been working for me.
Good Luck in your job search and with your new grandchild!