Tried, Week, Muscle Pain, Back pain and Neck pain

I am a 25 year old female. I have suddenly been overcome with tiredness and weakness. Followed by headaches, lower back pain (spreading numbness/restlessness into my legs and the most uncomfortable part), arm pain and neck pain. The last thing is cramping in my abdominal area (like I am on my period). Opening a car door is sometimes difficult. I get hot and cold flashes. Sometimes its gone and then its back. I feel better after I wake up (refreshed almost) but then a few hours later, boom, the tiredness and weakness returns.

I know these are pretty common, hard to pinpoint symptoms but I need to know if I should see a doctor? Some at work have sent me home because they say I have the flu. Flu? I have no fever or other flu symptoms.