Clicking in My Ears

About a month or so prior to my trip to Afghanistan, I noticed a clicking noise on my land line. Upon returning to the States, the clicking continues. It reminds me of Monica Lewinisky and her good friend Linda Tripp, but could it be something bigger? It's recently come to light (although, I already had a pretty good idea it was happening) that the National Security Agency (NSA) has been collecting phone data of American citizens - in the war on terror.

During my journey, I needed to call Afghanistan on my cell phone (to tell the guide I missed my connection). Has that raised any red flags with NSA? Is someone keeping track of my phone calls? Or do I just have a heightened state of awareness?