No your not getting PTSD from him, its not contagious, or if someone around you has it they can make you feel it to like when people feel depressed and you around them and you feel depressed, its probly the family stress. In Post Traumatic Stress Disorder usually a sound like a loud bang or something (similar to but not 100% close to weapons, I.E. guns and bombs) or loud noises will give them "flashbacks" as you called it and the person believes he or she is currently living that moment.

Well you can't get PTSD from him. However you can be feeling all these things because he has it. I had PTSD and I got help. I dealt with it for a year, not bad, but it is difficult. Your dad isn't getting the right form of help. I actually went to a partial hospitilaztion program and got some mega help. It was great. With PTSD you have to talk about whatever is traumatizing you. Once you do that the flashbacks start occurring less frequently. Your Dad may be feeling that he served to help people so he is afraid to ask for more help. but really it does work. I get how it is hard for you also. Not having a Dad that will talk to you must be extremely hurtful. You seem like a very sweet person and it makes my heart go out to you. It will eventually be okay. I think you should call up your doctor yourself and tell her exactly what is going on. She will know what best to do. your mom can't not allow you to go on meds if you need them. your mental health is just as important as your dads. It sounds like your family has gone through a lot since your dads return. PTSD is a serious thing and it drains anyone a lot. Treat your dad with utmost respect. Don't cuss him out. Show him you are gentle and aren't going to hurt him. Don't bang things around him or slam doors or anything. That won't hhelp. I don't know what triggers his flashbacks but because he fought in a war I assume loud bangs are some triggers. Your family is under a lot of stress but things will eventually be good. You need happiness in your life. Go find a friend to hang out with. Or even if you call your doctor and tell her all your symtoms and make it sound severe enough she may want you checked in to a hospital. Partial programs are the best. It's not a strict as an inpatient ward. It's basically just groups where you can talk about everything. Absolutely anything. EVeryone will listen and support you like nothing youve known before. You can make friends and give each others numbers ( you'll have to sneak them to your new friends because they don't allow number exchanges). It seems to be the bet thing for you. I am not saying you are crazy because I wasn't crazy but these places can change peoples lives forever. try it out bud. Hope this helped. take care. I hope things get better for you soon.