aogzer, I had a similar experience with DC 3 years ago. My dive buddy was a longtime friend who is about to retire from diving (she's 70ish). I took her diving as a last hurrah in the Caymans. She had a wetsuit on and overweighted herself (25 lbs) relying on weight to get her down instead of bouyancy control. Needless to say, at 70 ft, she sunk like a rock and went to 130 ft in a matter of seconds.
I am certianly no divemaster, but I took off after her. I couldn't hold on to her to inflate her BC, as she kept flailing about. I wedged my fin in a crevice in the Bloody Wall to keep us from sinking further as I tried to communicate our depth to her..145 ft now with all that flailing about. Our air was hitting 1400 psi. She inflated her BC and tried to ascend, but the weights proved too much for her. I tried to assist her but she grabbed my regulator out of my mouth in her flailing about, so I tried to tell her to deflate her BC gradually and drop some of her weights and I would do the controlled ascension. She dumped her weights w/o deflating her BC and shot up like a bubble on a mission. I shot up to catch her fin and pull her back but she kicked me off and went on up. I watched her rise to the surface while I stopped at 30 ft to do a safety stop. That may be poor judgement on my part, but hey, 2 divers at risk for an embolism isn't a good idea...you know.
The crew on the boat was great and the DM saw my friend shoot up and he followed her up too, as he never was as deep as we were. My friend never had any symptoms and seemed fine. She brushed off any medical help and was upset we were fussing over her.
That night at dinner is when it hit her. She felt dizzy and couldn't walk a straight line like she was drunk though she doesn't drink. I called DAN and they responded with a jet to the island and flew her in to the nearest chamber in hours!!! DAN was awesome. However, I was left behind on the island for the rest of the week to dive as a third wheel with newly made diving friends.
Three days later and symptom free, I am flying home. About an hour into the flight my fingers start tingling and my arms seem numb. I am dizzy and nauseas and feel like I am going to blow up. I did a 20 hour no-fly from my last dive before flying, but I guess with the "diving incidendent" of my buddy factored in, I had more residual nitrogen than 20-hours resolved. I don't know....
Anyway, once we landed, I felt better and thank goodness I didn't have to drive home from the airport. The tingling was present for several more days but it did start to subside, but for some reason, I NEVER did suspect DCs for myself. I don't know why. Inexperience with it, I guess. All is well now, but in hindsight, I wish I called DAN for me and gone to a doctor.
Lesson learned: I am by no means an advanced experienced diver but I will be sure that from now on, any dive buddy will agree to communicate properly underwater, not flail but TRUST the dive buddy, and abide by all safety precautions before, during , and after the dive.