I got caught in an achilles for the first time maybe 2 months ago by my instructor. Instead of tapping or rolling I let him throw it in deep. I wanted to see how much pain I could take on my achilles.
I learned 2 things: #1 I can take more pain then I thought and #2 That was a very dumb idea.
It's important to test your physical and mental boundries from time to time but my foot felt like the hold was on at all times for like the next 3 weeks and then faded slowly. I think my achilles was bruised.
Be careful because there is no protection for your achilles.
I went to an orthopedic surgeon and he said the tear was minor. I couldn't walk really for 2 days. Didn't sleep much. This happened the Wednesday before Thanksgiving. I didnt train again until the end of December and even then it hurt. As far as therapy. I just did it myself. Just stretched it so it would heal good. I also had it treated with a cold laser, t to increase blood flow and speed healing. Needless to say, it hurt like hell. I have a permanent discoloration and bruise looking thing on my achilles. I tap from straight foot locks now even when I let the 14 year old kid in class throws one on me.
You need to tap early. Even if you are not really caught you should probably do it anyway. It is not like an armlock where you will feel an increasing amount of pain, a leglock will not hurt and then it will snap all of the sudden. I hope your foot alright. I would go see the doc and see what he says.