Best alternative medicines or therapy for anxiety and panic attacks?

hi i am suffering from them for 2 years,i went to see my gp first gave me some propranolol ,did not work ,and go back to him after after 2 months this time he gave me citralopram ,but it gave me serious diarrhea ,and side effects but made a little impact but all over come by side effects, after 7 weeks on citralopram and went back to him,he told me to stop that citralopram because of diarrhea, he gave me Diazepam ,for two weeks ,did not work ,because i am working with heavy machines he told me to stop Diazepam .and he told me because of my job he cant give me any thing than propranolol ,and try to relax without any serious medications ,try kalms or any therapy,i tried kalms and acupuncture in the past did not work ,i am doing yoga and regular exercise, is that st john wort or rescue remedies work ? where can i buy st john wort in uk?can i take with prpropranol and thyroxine 25 mg which is my regular medicine? is that st john wort make you drowsy or dizzy?