You really need to see your LLMD. This could be from restarting your abx and be an allergic reaction to one or both of them. Itching all over is a common sign of this, not for lemon juice. Last time I had penicillin, I was itchy all over and it was going down my ears and down my throat!
![smhair](/community/emoticons/smhair.gif)
Not good!
It could easily be something else, but for your own safety, you really need to see your doc.