Everyone says stop trying.. It will happen

I feel obsessed. We have been trying to get pregnant for 8 months now and every month my mind plays tricks on me. I get me hopes up and think I feel symptoms then bam here comes af. It's so frustrating. I am 25 and my husband is 31. Everyone says it will happen when you stop thinking about it but I want it so bad I can't stop. I am worried that a previous ab when I was 18 has somehow messed up my body. Please help. Doctors won't even consider checking us until it's been one yr