Others have spoken to how to access a car (rent or borrow, basically). But I think another element of the equation is specifically where you start your practice driving, and easing back into things. I can understand the hesitation to not go to a rental place yourself and immediately get on the highway after that big of a time gap in your driving.
I think the ideal thing to do would be to get a friend to come with you in their car and have them drive you to a big empty parking lot. Then you take the wheel and drive around the parking lot very slowly until you regain some confidence.
Phase 2 can be driving slowly around someplace with roads but that has a low speed limit and few pedestrians. Office parks on a weekend, or cemeteries, are ideal. You can practice all your turns and stops and go 10 mph if you want. That's golf cart speed. If you do phase 1 and 2 in the same day, your friend can drive you between sites.
From there you can do residential back roads, then main roads, then highways. Immediately expecting yourself to get on a busy road may be setting yourself up to fail, at least in terms of your anxiety. You didn't originally learn to drive in one day, so go easy on yourself on getting back into it when you are ready. But also remember: you've done it before! So you can do it again.