Severe headache! Enough to seek medical treatment?

I have had a severe heachache since Halloween. I attributed it to stress and then to sinus pressure. I have taken Excedrin Migraine, Excedrin Back & Body, oral Percocet, Aleve and I have recieved a shot of Toradol. I am in excruciating pain and I am at a loss as to what to do. I have had the headache, dizziness, severe nausea and now muscle spasms in the upper back underneath the shoulder blade. I am not sleeping well, I am irritable and also my upper calves and Achilles Tendon is very tender and throbbing. Should I go to ER or do I wait this out? Any advice would be appreciated! :)