Really weird dreams.or are they dreams?

First things first.. What an emotional story! I feel for you, truly. I lost my grandad to Huntington's disease a number of years ago and in the final stages it can be painful to witness. Luckily like yourself I don't carry the defective gene, for which I'm eternally grateful. Your brother, bless his soul, must have been in a very bad place mentally at the time, but you can surely take some solace in the fact that he didn't suffer for the final few brutal years of the illness. In regards to your dreams, in my opinion they will be caused both by your PTSD and your medication. They sound extremely vivid and dreams like that can confuse/scare/bewilder us. I agree with the above answer that writing your dreams down after they've woke you up may help you make sense of it all. And I also agree with the other comment in the sense that, although you have suffered all this loss and pain, you are still here. Make a difference, raise money for the cause to defeat the illness that took your loved ones (Huntington's Disease Association) so that you can feel proud in the fact you may have spared someone else the same pain that you've felt. Keep your head held high and above all enjoy life! It only happens once. I truly wish you the best of luck in your life and I hope you succeed in making some sense of it all.