I know exactly how you feel.
It's a horrendous feeling, that you just can't meaningfully connect with anyone.
The future seems like a deep dark bottomless pit when you go looking into it. I think that's why the key is learning to not look too far ahead. Just keep letting life do as it will and learn to roll with what's currently going on....something borderlines struggle tremendously with.
Just keep taking things one day at a time.
I wish I had helpful advice, but unfortunately I'm still in the same boat, haha. So my advice couldn't be too great!
You're not alone though!
Best of luck with your T. Congrats on taking the step to seek out one.
I truly hope things get better for you.