Island5OIF3

Good evening, I have been rated 100% for severe and chronic ptsd since 2007 along with 8 other ratings ranging from 10% to 60% and recently was diagnosed and service connected for Parkinson's disease from my TBI sustained in combat in 2005. The VA sent me paperwork and ratings for my Parkinson"s diagnosis and awarded me an additional 100% disability rating on top of my multiple other ratings as well as my 100% ptsd rating. I have been drawing additional SMC pay on top of my normal disability VA pay at the S or what is referred to the home bound rate ( around $300.00 ) extra a month. I was at a veterans session this past week and a former VA service officer was there explaining our pay and medical benefits and one of the questions asked by another vet was if anyone like himself had two separate 100% VA rated disabilities. I raised my hand and he asked the former VA rep why he wasn't getting paid smc on top of his 100% rating and that's when it got confusing for me with my TBI. Apparently to my understanding if a veteran had two separate 100% service connected VA disability ratings, their SMC pay should be much higher than the household amount in the $300.00 range. Can anyone verify or confirm this. The former VA rep stated that the two combined 100% ratings should place additional SMC pay to around an additional 12 to 13 hundred extra dollars a month. Is this in any way accurate or Am I misunderstanding all this because of my TBI? Thank you in advance and thank you God for Spell correct.