Suggest Remedy For Delay In Periods,mood Swings,frequent Urination And Lower Back Pain

hi,am 21yrs of age and am in a sexual active relationship.I missed my period 2months ago,did a home pregnancy test which came out negative but am currently experiencing the following: frequent urination,fatigue,abdominal discomforts,lower back and abdominal pains,headaches,joint pains,easily get hungry bout i pick around the food when i get it and i get moody easily. What does this means.