Problems since OS updated 2 days ago

Hi,

2 days ago I got a popup to update my OS, which I did. Ever since then, my emails (Gmail) come up empty and various things crash or freeze, such as playing Words with Friends. Very frustrating not to be able to read my emails on my phone anymore! I have cleared the cache and that helped for awhile, but then stopped helping. Sometimes just rebooting the phone helps for awhile, but not permanently as the problem keeps recurring. Wish I could rollback to the earlier OS. Is that possible, or is there another fix? Are other people reporting this problem in the past 2 days? Tried calling Verizon but put on hold for interminable period. Even their bots don’t respond! Thanks in advance for any help you can provide.