Hi Kathi,
I had my revision on the 29 July and my vents are now 'too big' according to the last scan I had a few weeks ago! But I have symptoms of overdraining and I'm actually going to have the pressure RAISED on Monday next week. CT's don't always reflect exactly what's going on in terms of pressure as I have learnt! If you feel better, that's the main thing. Believe me, you'll know if you're overdraining! I know I am as I feel worse towards the end of the day and after moving around and the pressure feelings are pretty bad. I feel pretty rough most of the time...but that's not because the new shunt isn't working....it's actually working perfectly well.....we just haven't found the right pressure yet (it's a programmable). I did have slit vents at the time of my surgery and apparently this takes a while to correct itself and for the pressures to return to normal, which is why 7 weeks after surgery I'm still up and down. If your NS isn't worried, I wouldn't fret too much...if you start to feel ill again...that's a whole other story. But if it IS overdraining, they'll probably catch it before it gets too far. Glad you're feeling so much better though! That's great!