I had 30 units of botox in my forehead and between brows 5 days ago - NO change. Could the injector have diluted it too much?

Before 10 days it is not reasonable to evaluate the outcome of Botox injections.  If there is concern about dilution, have them mix it in your presence.

With Botox, it is important to understand exactly what Botox does. It relaxes the muscles so they won't contract and cause wrinkles. So the Botox is working if you can't contract the muscles well. Sometimes, even though the muscles are relaxed, the lines remain because if they were present for a long time, they can actually get kind of "stuck" in the skin. In that case, a filler can further improve the lines. If your muscles are still moving normally, then something isn't quite right and you should follow up with your injector to see what may have happened.

30 U is a pretty strong amount , but can take up to 14 days to work. I suggest if you dont see improvement in 10-14 days go back to your injector and inquire as to why you are not seeing results.  I hope they took photos before to compare when you go back.  Best, Dr. Emer.