MY IntelliJ stopped working properly after version update to 2018.1.1 (no other versions work too now)

Hello people, I hope you are doing fine, and are able to help me..
I have been using IntelliJ for a pretty long time now, and have never had this issue before.

When I updated IntelliJ, IntelliJ stopped being able to see nearly any of the files in my projects - it only shows the.gitignore, pom.xml and such, but no source files or whatsoever.
Then for my maven projects, it started giving the event/error(or what it is called) of "Non-managed pom.xml file found:" where I am able to click a button which says "Add as Maven project", which then finds the source files in the project folder, but when compiling(running) it, it cannot see ANY of the maven imports(dependencies) and just says it could not find the packages for ALL of them you know..

If I close IntelliJ and delete the .iml and .idea folder for the project, and then imports the project via the pom.xml into IntelliJ again, it will work fine FOR THAT "SESSION", but when I restart IntelliJ, the above will happen again. :/

For every IntelliJ restart(not when deleting .idea and .iml files, but when I just close it and start it again), it also does NOT remember the chosen SDK, which tabs has been opened, any database settings or anything at all. It just says: "Non-managed pom.xml file found:" and goes on to not recognizing any imports...

I have tried to make a whole new Java project, adding the Maven framework and such, but then again, when closing it and opening it, it will give the Non-managed error..

I hope I made it clear! If not, then please tell. :)

Thank you! :)