Frustrated

Been TTC for a year and a half. It is getting harder and harder for my emotions to take. Everyone just keeps telling me to relax, it well happen when it is supposed to. I just want to yell that doesn't help, after a year and a half that doesn't help. I get really bad pains in my stomach some times and it isn't when I'm having my period, have for about 13 years, and doctors haven't figured it out ands I am wondering if that has something to do with it. I asked my obgyn if I should get tested for endometriosis and she just keeps wanting to try other things first. Any advice