My DD has asthma, although the actual diagnosis is 'wheeze associated with viral episodes'.
She had her first attack at around 15 months - no risk factors, and fifth child, so quite a shock to us. She was first hospitalised at 18 months, and we had a major inhaler episode to keep her out of hospital when she was about 20 months. It hit home when we took her to hospital unconcious at 22 months.
We were in and out of hospital a lot between the ages of 2 and 4. We basically dropped everything when she needed to go in, and called upon help from friends when necessary (no one could possibly object).
We co-slept so I was always alert to her breathing. Even after she was in her own bed, we would bring her into ours when we felt she was at risk of an attack. Now, we will sleep with the doors open, and she will get up if she needs her inhaler, or I will here her coughing.
We were told by the GP that if you couldn't hold them for 2 hours with the inhalers, then you needed to go in, so I just used this advice. I distanced myself from the decision making - it was better just to accept the advice. If it was over cautious, then we would be sent home again, but mostly it was spot-on. It is much better to arrive in hospital sooner rather than later, because the treatment is much milder, and will take effect much sooner.
DD has just turned 6 and it is 18 months since her last hospital admission. She had a year of being virtually wheeze free. This last winter she has been quite wheezy but has been able to cope with it herself (it is not as brittle), and she has been able to tell us when she needs her inhalers.