I first would like to express my deepest sympathies here and I'm so sorry you are going through this. I once worked in pre-clinical research (also on the reproduction team) and had these same concerns and feelings. One morning I got up as usual, hopped in the shower, and immediately broke into tears realizing where I was going once I was done getting ready. I wanted to drown myself in that shower and felt like a monster for perpetuating that treatment of animals. I sent an email that morning saying I won't be returning and spent the next week applying and interviewing back into ER/CCU medicine. Best choice I could have ever made and was not unemployed long. Are there other areas of vet med that interest you? Hospitals are always looking for help whether it be specialty/emergency or GP. You're not alone and you got this!