I can relate only I didn't get panic attacks just tighten up. My dad was an alcoholic and did a lot of yelling. Everytime I needed help with any homework, I never knew what to expect. He'd either try and help or get mad at me because I didn't understand the assignement. I think when I was getting better after my dad was in recovery, I then and still do have a fear of either failure or acheivement. I didn't exclusively blame my dad for this but it didn't help. I had to go to rehab eventually for my alcoholism and learned more myself. My dad's totally different now and has apologized for his past. I don't know about your dad, but if you have PTSD, don't be afraid to get some additional help. I'm not a big fan of doctors but feel better when I get into support groups. Alanon is good for that. Although it's for ppl brought up in alcoholic homes, it's not exclusive to ppl who were brought up in a disfunctonal family. I don't know what else to say but try not to let your past define who you are now. Easy said then done but it's true.
I don't know if you're on medication but they have that for PTSD. I've heard it can be a hard thing to treat depending on how bad it is. I had a friend who had it real bad.