Throwing up, diarrhea and having bad cramps during period.

hi im katrena and im 15 and i have been having really bad cramps when i was 14. i got my period around 10 or 11 and it was really early and i never had that problem before. but now since i was 14 and was playing soccer in the summer i was sitting on the grass alot and my grandma says the whole problem with my period was because i sat on the grass but i didnt think that was true. so one day when i woke up i felt cramps coming but not really bad ones. i took a shower and when i got out of the shower i started to feel really bad cramps coming so i decided to take a midol because that always helps me while having my period. but this time it didnt when i started to walk i collapsed on the floor feeling really bad pains and i was screaming from the pain it was so painful i couldnt even walk i had to crawl and my grandma didnt know what to do so she just made me lie down on the floor and just take deep breaths and gave me water. it was so painful that it didnt go away for over 1 hour i couldnt even eat anything because of the pain i was in. that only happened one time and i was so scared that something was happening to me. and another time it happened in december i was feeling really sick at 2 in the morning so i went to the bathroom and threw up and i couldnt stop until it was 5 so i only got 1 more hour of sleep so i could get up for school. my grandma said i should go to school and see what happens because she thought i just ate something funny. so i went to school and started to feel bad cramps and i keot on going to the bathroom that day. it was really weird that on every class i had i had to go to the bathroom. so when i came home i just layed down and went to bed. but today when i woke up i knew i had my period because of the cramps but it wasnt really bad cramps until an hour later so i just laid down on my bed until i felt really sick and had to go to the bathroom. i did throw up a little bit but not a lot and i also had diarrhea and that was the first time i had it during a period. this has been going on for about and hour now but now im feeling a little better and midol did not work this time again because i had to take one when i woke up just incase the incident when i was screaming from the pain i was in would happen again but then it went away and came back 20 mintues later and then i started to have even more pains so i laid down on the floor on my back. it didnt really help but whenever i put my knees close to my chest i had to go to the bathroom to get everything out of my system. i didnt throw up i just had diarrhea. i did feel like throwing up but i didnt. so please if anyone knows what is wrong with my period olease tell me it would really help me. please and thankyou.