Ice Cold, While Overheating

I did four miles tonight.  It was 80°F while I was running, and that was not fun.  I can't imagine how people run in the heat.  I guess it must be something you have to get used to, like running at altitude.  I'm much more accustomed to running in cool and often windy weather.

During the first mile, my Achilles tendon on my right foot was killing me.  I stuck to a very slow jog, out of fear that I was injured and may make it worse.  After the first mile, it started to feel a little better, so I pressed on carefully.  I barely picked up my pace, because it would kill me to have to miss out on the race from injury.  I also noticed the pain in my left foot coming back, but not in a sharp way.  It was more of an aching of the tendons in the top of my foot, between the second and fourth toes.  Because of these pains, and how my feet have felt since last Thursday's big run, I decided I should soak my feet in ice water for 10 minutes.  When I found that I didn't have enough ice, I through some frozen cold packs into the bucket.  Not only did that help the water line come up, it also made the water almost unbearable.  My feet did feel better afterwards, so I think I'm going to start doing this every time I run.  My biggest fear is that consistent running will lead to shot knees and ankles by the time I'm 40.
According to Achilles Tendon, footwear with extra cushioning under the heal can help an injured Achilles tendon, by decreasing the amount the tendon stretches and limiting the calf muscles' range of motion during strides.  This is a temporary fix, and should not be continued after the tendon is healed.  I do have some shoes with a high heel, and I plan to wear them throughout the day, instead of my VFFs, for the next few days.
I also took some glucosamine today.  I'm hoping it will help my joints, although supplements have recently come under fire.  First they were good for you, now they are said to be ineffective.  What if they are wrong in them being ineffective? They are cheap, so I'm going to keep taking them.  If they don't actually do anything for me, I will just urinate them out with no harm done.  Also, I'm going to take a dose ibuprofen to help with any swelling in my joints, and potassium, eaten as bananas, for the soreness.