Support Memory thinks it's full, apps don't always exist, phone rooted.

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http://androidforums.com – I know there are tons of repeats of these questions, but I'm not good with techno-phone stuff. Computers I can handle, but phones are beyond me. Anyway, my poor phone is quite sad, especially lately. My biggest problem is that it suddenly thinks it has no memory- I have deleted a bunch of stuff and the phone still says it's full, but I look and it has tons of memory space on SD and internal. It wont let me update, surf internet, and most importantly- text. Next problem is that sometimes my phone apps don't exist, then I restart my phone and they do again, but not all will be there, (General)