Achilles heel cracking/creeking?

When you said "inflammed" you answered your own question. My guess is you simply have tendonitis in your achilles. I run cross country/track at the college level and I had the same problem a few weeks ago. The trainer at our school had me stretching it every day 3-4 times a day, icing it to help with the inflammation, and I would also suggest getting a "heel lift" for your shoe for whichever achilles is bothering you. It had the same "creeking" sound and feeling but it's completely gone now. Just make sure you stretch it and ice it every day to relieve the inflammation. Also standing on like the edge of the curb or something similar with your heel of the edge, and lower your heel and raise it 30 times/once a day to strengthen it. It's not long term if you treat it right ;p