I have been working out consistantly for about 20 years, believe me I know some days you need a break. Try working natural rest days into your routine like 2 days on 1 day off and see how that goes. On those "rest" days I stick to restorative work like easy walking or yoga.
Every now and then I'll feel ill, really tired or just sick and tired of working out. So I tell myself I will take a week off from working out, just doing restorative work. Usually by the 4th or 5th day I too feel refreshed and energized and I find myself walking up the big hills in town and wanting to lift some weights again.
Take your day off and come back to it tomorrow. Rest is very important for recovery.