No problem dear its a very common problem faced by girls during their reproductive phase.
Look there are few things which should be done like if you are suffering from pain you may opt for Analgesic
which would provide you relief ,dont do sternness workouts,you should take rest during your periods,
Another thing would be going for Combined Oral Contraceptives
pills which will regularize your periods and would also help in reducing the cyst
And dear to tell you About 95%of the cysts are Benign so no need to worry a lot keep your calm and lead your life.