Reiki brings alot of things to the surface really fast. If you work on physical or psychological issues they can come on as a huge wave and seem overwhelming. A person with a mild cold in its early stages can come down with a good one. The good news is it is shorter lasting and gone sooner. The same may be true with your anxiety. I do not recommend the prescription drugs though as they are truthfully just a bandade that covers the problem. You still have the symptoms and they are still there the drugs just shut down the part in your brain so you don't feel it.
It may seem very fearfull to face your anxiety and that is real. Someone who has reiki 2 or a Master could benefit you as they have attunements to different symbols to help you.
Namaste
Healing Hands