Fireworks and stressful dogs

Blake, my dog, can’t stand loud noises. He freaks out at guns and fireworks. He will literally start shaking. I give him medicine to help him and I diffuse lavender and put some lavender on him. And he still curls up in a small spot and shakes and I feel so bad for him. Even worse today I’m petsitting and had to leave him with my mom and sister. We all live together so it’s not a stress stacker by moving him to another location. But I felt bad leaving him but I have a responsibility. I know he will be okay. I know I’ve done everything I can for him. But I still feel bad. I just want to hold him and make him better. What does everyone do for their dogs during stressful times?