I'm afraid I can't help you from the experience point of view, but I hope you find someone who can, and get some positive developments.

I have a terrier that developed epilepsy at about four/five years old. She is nine this year, it is controlled by medication. She still has seizures from time to time, but, otherwise is fit and healthy and lives an active life. wanted to breed from her but decided against it, although the likely cause was her falling on her head/neck from my shoulders.
When she has an attack we try to keep the light from her and to comfort her. She does not have problems weeing herself, but, needs to go as soon as possible after the attack. Normally recovers back to normal in a couple of hours. Her hindquarters tend to be a bit shaky for this period.

Although a great shame it has overall not affected her life very much. Hope that is some help and comfort.

Thanks for everybodies helpful comments on this.  Feeling less alone now.  Having talked to a knowledgable vet at the practice who did the MRI he answered a lot of my questions and it was good to get some useful feedback from him.  Will keep you updated with our progress.  She really is the most lovely little dog and I love her so much big softy that I am.  x

I had a border terrier with epilepsy for years. It was on medication, which controlled them mostly, but it still fitted every now and then.

After a fairly short while you get quite blase about it. There's really very little to do. Just be ready to cushion its head with your hands if it really thrashes about to stop it banging it too hard on anything. The fit will stop, the dog won't even remember it's had it and you'll both move on until the next one (and once you get the medication and diet right, that could be months or even years off)

As flashy says, keep fingers away from mouth.

We treat quite a few dogs that suffer from seizures. All live a happy  fulfilled life on medication, sometimes the number of seizures they have increase and a blood test is needed and in most cases simply increasing the medication short term is enough to keep the seizures under control. If your Terrier is to be medicated it may be a bit of trial and error until you get the dose right. The cost of medication is very reasonable compared to some veterinary drugs.

On a personal note, we had a Terrier years ago that had a seizure when only a very young dog whilst out walking one day. He recovered and we thought nothing of it. 12 years later he had another one which seemed to last a little longer and take more out of him, my dad was about to take him to the vets when he just came out of it. This Terrier never had a vaccination or a visit to the vets in the whole of his 17 years, he just went to sleep in the back garden one day and never woke up.

Hope your little dog will be okay Alice