I recently tried to change from Spiriva Handihaler to Spiriva Respimat. I thought it would be easier to use since I find the little capsules hard to open and they occasionally seem to be "duds". However, the Spiriva Respimat makes me extremely dizzy and causes chest tightness and dull pain. Needless to say, I switched back. Has anyone else experienced these side effects. I don't understand why basically the same medication can cause different reactions.