Wow, what a terrible event you went thru. I know a fellow who went to a dermatologist to have a wart removed...and that specialist hit a blood vessel and the fellow almost bled out in the office! The doctor had to put a tight turniquet on the foot, and other extreme measures to stop the bleeding. This patient never went back to that doctor, for good reason!

Did you ever have an Xray of that foot to see if any fragments remain? I sure would have.

Do you get blood work at your regular doctor's visits? Like C-reactive protein, or CBCs (to show infection)?

I think the light skin tone reflects lower circulation and poor blood flow. Then that happens, then when you warm up there is a time period when things hurt as the blood returns.

Here is a link I just found on how to deal with Sea Urchin venom stings:
http://www.wikihow.com/Treat-a-Sea-Urchin-Sting

Here is another link about "long term effects" of the venom:

http://web.tiscali.it/actiondive/div...each%20Boo.htm

Sounds like a horrific experience. When I had my spider bite on my left ankle....it bothered me for over a year...and still that ankle swells sometimes today. (this was 10 yrs ago). The bite cleared up visually with antibiotics and steroids, but the pain persisted a long time.