Fingers crossed you can get it resolved. I'm at a loss these days around my foot, having had multiple diagnosis' and still not feeling it's right, only it's causing issues! I've got more into road biking as i don't have a choice as running 5-6 days a week just isn't an option anymore, although i'm trying to get back into it a little bit after giving up entirely back in March.
Similar to you. Road biking is just a little boring. I miss the trails/mountains. I bought a mountain bike, but the trails here are highly technical and i don't have the skill required to ride them. Although not sure i want to learn either, just too high risk of injury if you get it slightly wrong.
Have you got a golf ball or anything you can use to massage the foot? That always seems to be the go-to for plantar faciatis if it is that.