Just thought I'd pass this on for what it's worth. A family member has seemed to be experiencing numerous symptoms which I thought were indicative of PA, the most distressing being a very dodgy stomach - which seemed to bear little relation to the food he ate - making it very difficult for him to get any real nutrition - as well as increasing breathlessness.
However he recently found that two of the tablets that he took for a heart condition were to blame both for the dodgy stomach and the breathlessness - both of which seem to have disappeared since he stopped the tablets (although that may be a very individual reaction).