Asthma in my toddler

Help! My toddler is 22 months and has had 4 bad episodes of asthma since he was 14 months, February was his third time and it sent us to the ER because after 2 breathing treatments, 2 hours apart and giving him Orepred in between he still was struggling to breath. Well, because of his asthma, I don't like for him to cry in the middle of the night, but he sleeps awful because he has gotten used to me getting him and holding him, I'm so tired of doing this with him, I'm exhausted. How do the mom's with toddlers handle night wakings?