Medical certificate for sick leave.

I am having a lot of stomach issues i am having heavy periods this week because from last 3-4 months i did not had proper periods due to hormonal imbalance but this month i am having proper periods with heavy flow also i am dealing with stomach issues that is feeling like vomitting and loose motions due to which i am having a lot of weakness. I am a college student for leave i need a medical certificate but will any dr give me a medical certificate for this issue. I think i need rest for some days i am feeling extremely sick and weak. To which dr should i consult a physician or a gynac ?? So that i can also get a medical certificate for sick leave ... kindly help will a gynac issue me a cerificate for this and will college accept this as it is a periods issue ???