• Unsure what to do?

Hello. My partner and I had unprotected sex in the last week or so of November. I experienced a good amount of early pregnancy symptoms so we thought it was possible I was pregnant but I got a light period after a while so we assumed the symptoms were related to that. It was a bit unusual as I've never experienced those before my period nor is my period ever light but we chalked it up to that. I took a pregnancy test and it was negative (just in case) but we assumed MAYBE it was too early. A few days later, I took one again and it was also negative so we figured that I'm not pregnant. I became ill (or we thought I did) and so some of the nausea spells, fatigue, and headaches were chalked up to that however I am over the sickness and am still experiencing symptoms. I don't wanna go to the doctor if I don't need to as I'm uninsured and they're expensive. I don't have tender breasts or anything which is why we've also ruled out pregnancy. Is there anything else that can cause similar symptoms?