How Can Consistent Headaches With Neck And Back Muscle Tension Be Treated?

I suffered a slip and fall two months ago and have been receiving chiropractic care for those issues. Over the last couple of weeks i've been getting consistent headaches nearly every day begining later in the afternoon and by bedtime they are full blown. I can feel muscle tension in my neck and upper back on the right side. The office is closed and otc medications, ice, and heat are not working. What can I do to alleviate?