Menstrual Problems HELP!!!!!!?

I have menstrual or period problems, I can`t afford a gynecologist, I went to one but my medical plan doesn`t pay or cover for all the treatments :( ,and sometimes my period takes more time to come. My period is regular, so I get it every month. I am NOT nor never have been pregnant, I`m unmarried, NO boyfriend, not ually active. I am worried, I feel very tried sometimes, like if something was wrong with my hormones. I am a young person in my 20`s, so it can`t be menopause yet. When i do get my period sometimes it comes with nausea, diarrhea, vomiting and dizziness or weakness, plus pain. Sometimes I have to stay in bed all day. Lately this month my period has taken more time to come, I am worried because it is supposed to come and it hasn`t :( .I feel like if something inside of me is obstructing the flow of my period. I hope that i don`t have any Ovarian cysts inside of me. Sometimes i feel so weak and tired that I feel like if i was going to faint. My sister had problems with her internal parts and with her period too so she had to be intervened and operated, I hope it doesn`t run in the family. I`m worried because when I get a job I can`t afford to miss days of work due to my period problem. I drink Midol and pre-menstrual capsules, plus natural supplements for the female reproductive system and for the natural hormone balance. Sometimes they help. I drink a lot of vitamins daily and/or natural supplements. Does anybody know some natural, preferably cheap supplements, vitamins, fruits, vegetables, healthy foods, diets, or things that I can eat to see if it helps me with my state of mood and with my period or menstrual problems or pains ?????? or healthy things i can do, some exercises you recommend?, etc