In reply to stoo2k:
I have had achilles tendonitis, i was around 5 years ago.
My physio thought it could have been caused by wearing flip flops when i was on holiday!
When I had it, I could hardly walk in the mornings due to it being rested all night during sleep. The first hour or two of wach day was very painful, but throughout the day it did loosen up and become less painful, but I still limped very obviously.
I had physio, and I remember it took around 3 months to return to normal.
If you stand with your back to a mirror and your feet together then look over your shoulder, you can compare both achilles more easily.
When I did this, it was easy to see as one achilles, where it joins the leg to the heel was probably 2 or 3 time thicker than the normal one.
I did the exercises each night and used anti inflam gel. Also the physio recommended me to use heel pads in my footwear to raise the heel and reduce the stress on the achilles during the time I had tendonitis.
HTH
Allan