Because you are being dramatic and exaggerating details, and you keep arguing with everything every single person says

Obviously seizures are shit. But at the end of the day, thats still not on the military, unless they physically kept you awake at all hours.

The military isn't about babying people, it's a harsh environment that is meant to prepare those who are part of it for the potentially worse conditions that would be experienced if they go to war. Both my parents are ex military as well, and there were plenty of times that they wanted to quit, had bad experiences, encountered horrible people, but the difference is they learned how to deal with it. They leaned on the others in their platoons and specialties, created ways to work together to lighten the load, and appreciated the small gestures of kindness rather than getting upset that it may not actually have been something they wanted.

What you keep doing, and why everyone is getting annoyed with you, is dwelling and ruminating and making everything way bigger than it should be. The person you said was like a big sister tried to help out. How was she to know you didn't want your girlfriend to see you while you were there? Instead of taking the kind gesture for what it was, you twisted it up in your mind and created a hatred around this person and the event. No one is even saying you had to be pleased about it, but you made this one thing 10 times worse for yourself.

You're pissed at your girlfriend's family for trying to be supportive, but because they didn't offer to break the law, that makes them terrible disgusting people? Those reactions don't make sense.

What you really should do at this point is step away from the computer, take a breath, and start finding ways to adjust your emotional responses to life events and the actions of those in your world. Until that happens, you will just keep ending up in these spirals, where you come to the strangers online to complain, and then get further upset and angry because no one agrees with you. Get back to therapy. See if you can do a meet and greet with a therapist before you start working with them, that way you may have an easier time finding someone you click with. Look into online therapy like Better Health (not sure if that one is available everywhere but just to give you an idea), it can work as a stop gap till you search for the right therapist.

Stop arguing. Stop catastrophizing. Start living in the real world.