Sorry to hear about your injuries. My husband was wounded a few years ago, and we are in the home stretch of the PEB process. Here are a few tips that have helped us:
1. Familiarize yourself with the VASRD (the VA ratings schedule). Look up the conditions you are being boarded for, and notice the difference in the ratings %. Sometimes it is just a word or two off. I am not saying that you should in any way lie about your conditions, but I know my husband had a tendancy to minimize his pain and symptoms in the beginning.
2. If you have migraines, keep a migraine log. We created an excel document, and I documented every headache, the symptoms, work missed, and if my husband had to sleep it off.
2. Put aside the "suck it up" mentality, and realize that the only way that the raters can rate you is by your records. Make sure to thoroughly describe your symptoms at every appointment. Some of my husband's docs just asked if there were any changes in his condition from appointment to appointment. I believe that the more time your records describe a symptom, and the more detailed they are, the more successful your rating will be.
3. I know that there are some really good PEBLOs, VA Reps, and PEB docs, but we looked at this whole process as "Us vs. Them". We never assumed that anyone had my husband's best interests at heart. We politely questioned anything that we thought sounded funny, and we went to every appointment already knowing what to expect. (I might be a little neurotic, but I actually read the VA manual on how a VA C&P exam was supposed to be conducted.)
4. Most people with PTSD are automatically put on the TDRL. Because of this site, I learned that if your other conditions are stable and rated over 80%, you could petition to be on the PDRL. My husband was initially offered 90% Army TDRL and 100% VA. We asked our PEBLO about requesting to be put on the PDRL, and she said it was basically a waste of time and that it never happened. We went to MEB legal counsil and asked about the regulation. She picked up the phone, called the PEB doc at the hospital, and our 199 was changed to 90% PDRL and 100% VA.
5. BE PATIENT! Maybe it's my cynicism, but I believe that the process is designed to be long and frustrating. The more ready you are to throw in the towel, the quicker you will accept a lower rating than you are entitled to. You will be dealing with these injuries for the rest of your life, and no one should be allowed to screw with the compensation that you EARNED!