My 5 month old Curly Coated Retriever is ridiculouly timid and nervous. She is fine with us and in the house, pretty normal crazy puppy, reasonably ok in our garden and utterly terrified of everything else. She can just about cope on walks with our very elderly dog but Old Dog is getting more and more doddery and doesn't manage walks very well, so Pupiranha is having to be walked on her own. She is scared of all noises so even though I steer well clear of other people and dogs just being outside makes her nervous.
I've been working hard to make being outside less scary for her and things had been getting better. She liked the snow and actually relaxed enough to play when we went to the park and a few times since then she has splashed in puddles or paddled in the river and although she doesn't like the noise the crows make she did enjoy chasing a big group of them.
We've had a few nice meetings with strange dogs too. She's ok with calm adult dogs that approach slowly, sniff briefly and then amble away ignoring her. She will start to follow them and frisk slightly behind them as long as they don't try to play.
Today however was an utter disaster. Just as we left home a chap shot past us on a bike that made a weird clattering noise, puppy dives back through the gate and won't come out. After lots of treats and playing clicker games she calms enough to get to the car. She has just put her feet on the edge to be lifted in when the German Shepherd a few doors down starts barking and barking. More puppy panicking so I lift her into the car and we head off. On the walk we encounter two border terriers across the field who are shrieking and snarling, a very zoomy lurcher puppy that will not stop jumping at her, cows in a field bellowing, noisy birds, chainsaws in the distance, some kind of bird scarer making bangs at irregular intervals, lots of dogs at a distance, the sound of kids in a playground somewhere, a brindle bullet that I think must have been a staffy who hurtled out of nowhere, knocked her flying and shot off, horses, sheep and a low flying helicopter. Any one of these is enough to send her into melt down on its own. She was a wreck and when she gets really scared she jumps up at me so I was covered in mud from head to toe. I think she'd like me to pick her up, handbag dog style but she's a big girl and that's not possible.
I decided that we'd better head for home as it really wasn't fair on her to continue but to get back to the car we have to go along a very quiet road. There is rarely any traffic on it but of course today there were three cars, a very loud motorbike and finally a bloody tractor. She crammed herself into someone's gateway and just hid. She was too scared to take treat by now so I ended up crouched in front of her to block the tractor and once it had passed half dragging her along to get back to the fields before something else came along.
She very nearly jumped into the car by herself in her eagerness to get away. 
She is now curled up on the bed next to me, pressed as tight as she can get, with her head in my armpit and I feel like such a useless owner.
Any advice on how to help her cope would be greatly appreciated but most of all I needed to rant. It is so sad that she isn't out there enjoying life like everyone else puppies.