Aggression Training for Dog

Hello and Happy New Year!

I'm not sure if this is allowed, if not I can repost somewhere else but I'd really like some community advice on this. I've had my dog for about 3 years now and we've always known she has some intense anxiety when it comes to strangers/other dogs. We did basic puppy training and impulse control with her when we got her and thought we were managing it as best we could.

Unfortunately I've been couped up with covid for the past week so she hasn't gotten as much attention/exercise and when I took her for a walk yesterday she did something she's never done before - bite me, multiple times. It was a situation where she was out of her mind barking at another dog we were passing across the street as I asked her to sit as I usually do in these situations and in the process of thrashing herself on the leash she bit my leg twice. I had thick jeans on so it only drew a little blood but it was absolutely terrifying nonetheless.

We need help controlling her reactions to other dogs from a professional. I would be willing to board her for some time and continue her education with regular sessions if that's what it would take, I just need to have hope that it will be worth it. We're in the Portland area and I'd be willing to travel within reason. I'd really like to hear from people that have had successful experiences with local professionals.

Please please please don't suggest euthanasia here. I understand that's a path some people take but I'm just not willing to take that route with her at the moment.