Yes, you are not alone! I still feel anxious and faint after taking the 3 med protocol since about March. I think it's mostly the Rifampin 300 mg twice daily, 3 days a week. My doc started me on that for 2 weeks before we added the Azithromycin, then another 2 weeks the Ethambutal. It felt like I was on steroids. Racing heartbeat at times, anxious, sleeplessness at night, dizzy upon standing, sudden hot flashes. I did get used to this after a week or so. Was already taking medication for anxiety and insomnia so my docs ok'd stepping up those meds a wee bit. It helps but not perfect. I consider myself fortumate that I am able to tolerate the medicines in order to try and knock out the MAC and manage the bronchiectisis. If you can, eat small meals/snacks throughout the day and stay hydrated.