Yes, it will pass quite quickly. Dont expect miracles from Inderal, it is a beta blocker, it will relieve the physcial signs of a manic attack (the racing heart, the shakes) but it wont have much effect on the mental symptoms.
Hopefuly when your antidepressant kicks in you will be free of panic attacks, but if you still occasionaly get one, it might be wise to ask your doctor if you can have a few Xanax, Klonopin or Valium to keep on hand in case of an emergency.
I wouldnt recoment taking benzos every day if you dont have to, but just knowing you have one in your wallet or handbag is a reasurance - knowing its there if you need it.