Got prescribed Ativan for airplane

I’ve been diagnosed with severe generalized anxiety a long with panic attacks. I usually feel a panic attack coming on right during take off for flights. My doctor prescribed me Ativan and I’ve never taken this type of medication to help with anxiety. I’ve only taken lexapro but got off bc of weight gain.

I’m afraid to take the Ativan bc online it says I’ll be extremely tired and could feel Depression and irritability when i come down from it. I don’t want to feel irritated on my trip. Has any one with anxiety taken it and how does it make you feel