I'm not sure why but I been so tired lately

I been getting bad headaches and not feeling good when I'm tired. It's not like being a little bit tired, but it gets really bad. I sleep pretty good at night. The last couple weeks I been super tired. I work full time but I don't even think it's that. It's like even on my days off I'm super tired. I usually eat dinner then after that I'm ready for bed. This isn't usually my thing. Anyone have any ideas on what I could do