Talk to Gynecologist on Problem In Periods

Aoa.my problem is that i am having problem in periods like firts i was having 4-5 days slowly slowly they went to 3 days from last 1-2 years now they are only for 2 days last month in september was only for two days.i was waiting to have it on 17 oct buy they came on 28 oct only for 1 day..i am gaing weight..stomach is out and over all body also.please help me what should i do