Sam, if Tom had already been septic, his girlfriend should have KNOWN NOT to just give him anything! She should have taken him back to the hospital immediately if things weren't 'RIGHT." It may or may not have made a difference. No one knows. He probably shouldn't have been released from the hospital so soon! These stupid insurance companies throw you out the minute you're conscious.
So please don't blame yourself. This isn't your fault. What if you hadn't been home? What if you'd been outside and just didn't hear the phone? There are so many "what if's" that you could drive yourself insane. So stop blaming yourself. Chances are it wouldn't have made ANY difference at all. The gf shouldn't have given him what she gave him -- it was probably toxic to him.
So even tho there's nothing to forgive, just forgive yourself. I'll keep you in my prayers as well as your friend Tom. God bless you Sam, and please take care of yourself, okay? Hugs, Lee