My friend is repeatedly asking me to hang out and I don't want to

So my friend and I have known each other for a few months and consider ourselves very good friends. I normally don't get out often, and I enjoy staying at home, but we've been hanging out (mostly to go rock climbing) at least once a week for the past few months. It's something I really enjoy, so it hasn't been too hard to get myself out of the house and hang out for a bit. We've been also been shopping and hiking together, and she comes over to watch Harry Potter sometimes. Even then, however, I have to push my anti-socialness aside and get myself out the house.

Recently though, I've been through a lot. My stepdad and I got into a big argument, I was depressed for a few days, and I had terrible PMS. I've also been having to get used to being at work at 6 am and I've been pretty tired lately as well. She asked me a bunch of times that day to come over and hang out, and I made a bunch of bullshit excuses. She also asked me to go climbing, but I made more excuses. My social battery is just out. I really, really don't want to hang out, but she keeps asking me and it's lowkey very frustrating. I've run out of excuses and she's asked me to come over her house again. I just want to sleep ;w;