Has anyone used a z-pack and had side effects like insomnia (hello, it's 1:49 a.m. here!), anxiety, jittery feeling inside? I took the first 2 pill dose about 12 hours ago and feel crazy! Was prescribed it today for strep/blisters in throat and body aches by a doctor at Urgent Care. I think I'm going to my regular doc tomorrow if this anxiety continues. Anyone else have problems with this medication?