I'm a 60 year old male. I've been very gassy
No need for concern
There is no need for concern. I do however suggest you have a colonoscopy to determine if your diverticulitis have caused a structure in your colon. Meanwhile, make sure to keep your stools soft, perhaps by means of laxatives. If it comes to nausea and vomiting in addition to an inability of passing stools or gas, you should go to the emergency department.
Hope this helps. Please let me know if you have further questions.