Wow. Anger, yeah that may be part of the reaction. But to avoid a good deal of the emotional muck, stick to what you know and try to avoid "what if" or "when" thinking. Just deal with things as they are in the moment right now. It can get overwhelming.
I didn't have a drug interaction like you have, but I had crossed paths with a very rare negative rod bacteria that mutates rapidly and can be drug resistant which is said to be fatal in those who can't fight it off with their immunity (like me) in 15 years. At the time of my diagnosis, my best guess was that I had been ill right around 9 years. I about drove myself and my husband crazy with all the thoughts and feelings because so few had heard of it and no one for a long time had anything to share direct experience wise with it.
Stay in the moment, stick to what you know, and I'll be rooting for you.