Sacrificial animal

Failing to Perform the Farewell Tawaf due to Hajj Stampede

  As-salamu `alaykum. In the Name of Allah, Most Gracious, Most Merciful. All praise and thanks are due to Allah Alone, and peace and blessings be upon His Messenger Muhammad.Last year, I made my sincere intention to perform Hajj & Umrah and by the will of Allah (swt) I was able to. Everything went fine until the last day where I found my self in the middle of stampede. Unable to get myself out if it, and with my last breath I was peacefully awaiting Allah(swt) to terminate my stay in this world, and while my lips, mind and heart were praising Allah(swt) and testifying to the Oneness of Allah (swt), I was also asking Allah(swt) to take me out of my trouble/test. I was not able to help myself, I was injured and had no strength at all. Allah's(swt) help came. I don't know how, but I got out, then gathered strength and finished throwing the pebbles. Howerever, the pain in body parts especially the ribs were increasing as my body cooled down and after about 1 hour I could almost not move and needed help to move around, and I was unable to perform the farewell tawaf. My group guide adviced that I should have an animal sacrificed next year/hajj. (This may sound weird to many, but those last seconds were the most peacefull moments I have ever had) Dear brother, would you please advice based on my events. Is my Hajj valid? Is the group guide correct in saying that I can wait until next Hajj for sacrifice? Do I have to go again to perform the sacrifice myself? How big shall the animal be? Any other related advice is appreciated. Wa Salamu `alaykum wa Rahmatullahi wa Barakatuh.