For the OP: After some thought, I'd suggest that you pay AMAS for consulting as to how you should fill out the FAA medical application (form 8500). I don't know and nobody here can determine for certain whether you need to check box #18(s). I suspect you do, but don't know for sure. If there was no medical diagnosis, then perhaps your discharge was administrative, not medical in nature. Get professional advice, there are ramifications for getting wrong either way.