worried and need some advice

Im 21 and i have had ovarian cysts since i was 16 and i was told by my doctor to get on birth control and that will help with the cysts and my periods and as im getting older and im engaged i told my obgyn that i dont' want to b on birh control my whole life so he asked all these questions and i told him all my symptoms and everything and that when he
diagnosed with PCOS and my doctor didn't do any test he just went by my symptoms and he precribed metformin which is a diabetic medication but its also used for to help women that have pcos. well part of the symptoms is nausea and diaherra and headaches .....well ive only been on it for 4 days now and i have all those plus sore nipples but thats not any of the symptoms and i dont' know if i should i call the doctor or just wait it out til the medication takes its toll im just worried its taking a bad toll on me. but im not sure what to do bc this is something totally new for me and im trying to deal with wedding plans and the fact that i was just diagnosed with pcos which can change my life.i am also sturuggling with my weight and this medication is supposed to help me lose weight i need some ideas on a fun way to do some excercises and diet plans. so if anybody has any advice for me id really appreciate.