Re: Clicking Sound
My son has clicking when he nurses and did have tongue tie (he just had it clipped). My nipples were not cracked or bleeding, but he did cause compression which led to vasospasms. I would have pain after he nursed, but not while he BF.
Here is a good article about it. If you think your LO has tongue tie you might consider bringing it to the pediatrician.
For advice... make sure he latches on well every time and if you suspect a supply problem start pumping after you BF. It will tell your body to make more milk. Also, I would recommend nursing before you supplement, that way your supply will not drop.
HTH! Hang in there.
Melissa, mom to my very busy 4-year-old little man and super busy 2-year-old princess.