Is 34 units of Botox too much?

34 units of Botox for the frown lines, crows feet, and forehead is reasonable.  Botox in your crows feet should not cause you to have sunken hollows under your eyes- it simply weakens the muscle around your eyes so you have less lines around the outside corner of your eyes when you smile or squint. Long term Botox of your forehead can lead to generalized diminution of your forehead muscles simply due to you not using them as much. The forehead muscles (frontalis) elevate your eyebrows and cause the the horizontal lines across your forehead, so diminution or weakness of this muscle may not necessarily be a bad thing if your goal is to lessen the appearance of your forehead lines. 

Excellent question. Thirty four units seems reasonable for the areas you had treated. Depending on the patient and their anatomy, some may require less and some may even require more. As times goes on and with repeated treatments, you may not need as much botox to relax the muscles.