Because your system is still good to go (as proven by your alternative user login) you may only need to clear caches in YOUR primary account......this will probably require a trip to the Terminal.
Unless you are comfortable working beneath the hood using the command line interface, you might want to do some Google research to get better informed on how to remove your caches within your primary user account, then check back here for a second opinion.
As a simple starting point, let me recommend a startup in SAFE BOOT MODE....details linked
HERE and
HERE.
Let us know how it goes.
