Hey! I totally think you should reach out to her. If I was in your position I would write/say...

"Hi, T. I know it's been quite a bit since we've spoken, but I'm really struggling. I tried to get in contact to set up an appointment, but I was told that there were no open slots for a few weeks. I've been having distressing issues (I.e weight loss, insomnia, concentration difficulties, etc) and it's getting more difficult every day to function.

I just really need some support or some help right now, and I don't know who else to go to."

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