Those Awful Dental Visits

One of my last major issues at this time is dealing with dental visits. I would very much appreciate input on how others deal with this. I'm probably not the only one with BE who feels the stress as soon as they lean that chair back to a flat-out reclining position. For me, it seems that no matter how I attempt to prepare myself, the need to cough arises almost immediately! I find is so very stressful that I've been tempted to cancel appointments, but know that that's not the solution. Comments? Suggestions? Thank you!