It's totally normal and in no way ridiculous, not in the slightest. Please, if you can, try to stop framing your response like this.I know I'll be fine but my mind has the zoomies with all the what ifs
I know it sounds ridiculous but I am so fucking freaked out by being alon
With bona-fide trauma response, which is what you're suffering from, there's a tiny part of the deep deep brain (lets call it spot x) that 'thinks' you're in mortal danger everytime you get triggered. There's no bargaining with spot x, no application of logic will affect spot x.
I've had a little look at the timeline here and your traumatic event was relatively recent. Because it's so fresh it may be more accurate to call your condition TS (Traumatic stress, without the post or disorder). Your brain is trying to keep you from danger. It's doing what is is designed to do, although that isn't much consolation to you I'm sure
If the symptoms last, say, over six months....then the traumatic memory is stuck in the "flight-or-fight" centre, it hasn't been processed so it can move to the normal "long term memory bank" where you could access the memory without the massive anxiety just as you could with any other memory - that is when it becomes "Post-traumatic" and becomes a major issue (not in any way demeaning your present experience)
Clearly, one of your triggers is being alone. Your brain won't let you (yet) trust your own logic that you are in fact safe. Write down "I am safe - my brain is trying to help me but it's got overprotective" and leave these messages all over the house.
I'd be extremely wary about benzo use for fresh trauma. The odd xanax or whatever when it's intolerable for sure, but anything over and above that is just creating more problems as I'm sure you're well aware.
While waiting for the brain to (hopefully) reprocess your memory, a daily (twice daily really) meditation practice is your very best bet. Mindfulness stylee....learning to identify what are thoughts and what are facts, and learning to not attach to our thinking but merely to observe it, and then to let it go. A regular meditation practice will also lower your baseline anxiety levels, meaning that any anxiety provoking situation will not be as difficult to navigate.