I think it’s important that your neuro does get a complete view, but it’s unlikely they’ll need exact dates, times, and duration of every individual symptom, so it will be fine to condense and simplify.
You can say things like: “In April I had intermittent burning in my fingers and some urinary hesitancy for a couple of weeks.”
You don’t need: “2nd April, 10:00-12:00, burning in left hand again. 4th April 15:30-17:30 approx, burning in right hand again. 7th April, trouble weeing - four times.” Not only will they not have time to work through every incident in that level of detail, but it won’t contribute much to the overall impression of what the problem could be. Be prepared to talk about what’s been happening, but you don’t need to treat it as if you were going to be cross-examined in a court of law, and have to give exact dates, times and specifics of every symptom.
Yes, you probably will be asked things like how long, and how often, but you don’t need to produce a log. Generalisations like: “Oh, about a fortnight” will be detailed enough. You just need enough to present a general picture - you won’t be asked to plot it on a graph or anything, so don’t get too bogged down in the detail. Writing up a diary every day, or even adding to it several times daily may be counter-productive, as it’s encouraging you to focus on what’s wrong all the time, instead of trying to have the best life you can in spite of it.