Rhema, while the day is probably coming when I'll need hearing aids, I don't use them yet and therefore have no direct personal experience to share with you. I can tell you that my students who do wear them normally turn them off, and put on muffs to preserve what hearing they have left.
But, that's for the range. On the street, if you're under direct attack, you may indeed have some additional hearing loss if you have to fire under the circumstances you describe. But as you balance competing harms and needs, you have to ask one stark question:
How much am I going to hear in the grave?
You might want to take this over to Carry Issues or Tactics and Training and open a thread. There must be some audiologists, ENT professionals, and shooter people with hearing aids on GT who have more knowledge and experience to share with you on this.
Sorry I couldn't be of more help,