I want to read my old post from last year in full, so I go into My Profile->Find all posts by-> and theres a list of them in around 2-3 sentences, I click on the thread to see my full post, but the thread is gone because the text book is sold, is there some way to see my old full post?

Thanks in advanced

Maybe try to do a search, but if you clicked the "sold" button, I'm pretty sure you can't access it anymore.