I don't know what to do. gained 5 pounds in 2 months, no periods since months, no sexual intercourse, can't go to a doctor for atleast a month. upset?

Amenorrhea: If you're not pregnant, the next most common thing would be hypothyroidism. Low thyroid may result in weight gain and absent periods. Unfortunately you need a blood test to confirm this. Other things can cause this too, but they also require an evaluation. Try going to a http://findahealthcenter.hrsa.gov/Search_HCC.aspx FQHC health centers can see you on a sliding scale and do cheap testing