3days ago I woke and my gums hurt to chew. Food is going between teeth. I brush and floss regular. Can't eat it is so painful but only when chewing?

See dentist. Go to see dentist to get your mouth/gum checked. I don't know why you take Plaquenil (hydroxychloroquine) to begin with. Condition like sjogren's disease with dry mouth/lack of saliva will give you at risk to have gingivitis- inflammation of the gum etc. You may have inflammation on the gum despite the fact that you brush and floss regular.
See dentist. You may have a cavity, a crack or an infection. See your dentist to determine the cause and get treatment.