Prev dx'd w/ diverticulitis (2010), past few months diarrhea, constipation, bright red blood & mucous in stool, pain navel to vagina, pain during sex?

See your doctor. The symptoms you describe indicate that something is seriously wrong and further investigation needs to be done promptly.
Getting worse... All of those things you describe could be associated with your diverticulitis getting worse...And that you need to see your regular doctor without delay. I would not just wait until your symptoms get worse or you develop fever or abdominal pain.
Chrons disease? Diverticulitis is pain in your left abdomen, you now have alternate constipation and diarrhea with abdominal pain, blood and mucus in stools with painful sex . Pls. Consult a gastroenterologist you need work up.