As long as you have provided the medical examiners with all the correct relevant information and passed, you have absolutely nothing to worry about, they obviously deem you sufficiently capable of flying. However, if you have retained such details, I would strongly suggest you obtain a medical opinion before flying, as Asthma can be a serious life threatening condition if it is not controlled appropriately with the correct medication. That said I’m sure as long as you are able to demonstrate that it is controllable thorough medication you will be ok.