Luckygirl, there are many different steroid inhalers. Sometimes you have to try a few until you find one which suits. I used to lose my voice on a regular basis, (I was a teacher so it was a bit of a pain), as my steroid inhaler caused thrush in my throat. The trick is to gargle after taking it.
I recently saw a cystic fibrosis consultant, as I have been found to be a carrier of the cystic fibrosis gene. He changed my steroid one to Relvar, the highest dose. I have absolutely no problems with it. I feel better than I have in ages.
In my opinion, you have to weigh it all up. A steroid inhaler, taken regularly and as prescribed, can for many people, help reduce the frequency of asthma attacks. I have been on three inhalers for 40 years and am still here to tell the tale. Forty years ago, when first diagnosed with late onset asthma, I was in intensive care for 6 weeks and it was thought I would not pull through! The wonder of our NHS 
Is it worth going back and speaking to your GP?
Hope you feel better soon.