the noises is just air and stuff in the boob hun, it’ll settle down in time 🙂
as for the back ache i’m sorry to hear you have it, have you been led down a lot? usually it’s just your back getting stiff from either the length of time you’re sat/led down in or the position you sleep in, i have a curved spine so am used to back ache but i find propping some form of pillow or rolled up towel near the base of your spine will ease the ache xx