Yikes on bikes... what an example of our own bodies working against us! I'm not all that horribly smart so to be honest I wasn't able to follow the exact explaination of the way your genomes have mutated, but consider this;

They say that evolution is just mutations in the gene pool that survive the years. Maybe you're the start of a whole new species?

In all seriousness though don't give up hope. Not being able to take antidepressants is bad, but that means now you've gotta get creative with your treatments.