My upstairs was always hotter BUT ALLOF A SUDDEN it is barely blowing cold air AT ALL! Is it def freon. I noticed the unit had some ice but was this from turning it down so low the night I realized it was blazing hot?

The unit should have no ice at all when working correctly. Shut the unit down for a complete day or night to allow it to completely thaw. Then check/change the filter/s. Restart the unit and see if things don't improve. If they don't, you may need to call in a tech to check the system charge, airflow, etc. Good luck and please let us know what is found.