My negs are ruined!!!!!

I went in to college today to process my film and have spent most of the afternoon trying to figure out what has gone wrong with my negs. They look really dense and of a very different colour to what they usually are, it made me look on the film type as they looked almost B&W. Concerned but didn't ask the technicians. Came home put the negs in the scanner and this is what I get:


Thought first that I must have overexposed really badly but i know for a fact that I had underexposed a few negs by mistake on one roll. I really don't get the disappearing heads etc. because I can see their heads on the negs!!! Really spooky and they are life guards as well!

I feel really really awful as most of the images were portraits and I had promised copies to people. That's the worst, it makes me look so unprofessional, especially towards my contact John in Southend that put me in touch with most of the people that were on those negs. God I feel bad.

Scanned other negs, they are good, so nothing wrong with scanner. It can't be the camera can it? Light leakage would have showed clearly. I can only think it was something wrong with the developer or fix. I want to scream and shout anything to get my negs back but they will off course forever be lost. And I had that thought to hand them into the lab, I wish I had but wanted to save money... Are taking a roll down the lab tomorrow, got half finished roll in camera have to know it's not the film or my camera.
This means that I have nothing to show for my tutorial tomorrow and have more work left to do than I thought. But as always I guess it could have been worse...