rewrite and redirect not working together

I've looked at a million different forums and threads and google and everything but for some reason I can't get this to work.

Options +FollowSymLinks
RewriteEngine On
#The following is the redirect

RewriteRule ^/?page/(.*)/(.*)/$  /blog/$1/$2 [R=301,NC,L] #removes the slash, redirect
RewriteRule ^/?page/(.*)/(.*)$  page.php?category=$1&title=$2 [NC,L] #rewrites the old url
RewriteRule ^/?page/(.*)$  /blog/$1/ [R=301,NC,L]  #adds the slash to the category, one level, redirect
RewriteRule ^/?([a-z0-9\-]+)$ /$1.php [NC,L] 
RewriteRule ^/?([a-z0-9\-]+).php$ /$1/ [R=301,L] 
RewriteRule ^/?([0-9]+)/news$  news.php?id=$1 [NC,L]

Code (markup):

There's my code. I'm trying to redirect /aboutus.php to /aboutus/ but I keep getting errors or the page just never loads. As soon as I remove this line

RewriteRule ^/?([a-z0-9\-]+).php$ /$1/ [R=301,L]

Everything works. I can access the page using /aboutus.php and I can access it using /aboutus/. Once I add the redirect, it stops working.

Pleeeeeeaassssseeee Hellllp!

 

/aboutus/ is a webpage? Looks to me like a directory. /aboutus looks like a page. I can understand why you want /aboutus to redirect to /aboutus.php but why /aboutus.php to redirect to /aboutus?