I think I'm getting a Lil bit worried now

Okay so I posted on Tuesday that I had went to dr for my yearly & my Dr found a fibro cystic lump in my left breast. Well i told my husbands mom about it & she said that it's something I need to worried about considering its in my breast & it's a lump. She said to always check stuff like that. Well she told me to call tomorrow & make an appointment with an actual obgyn ( I go to the health department) & have a mammogram. Its scary to think that something could actually be wrong. So please pray that nothing is wrong & that I'm healthy. Anyone ever went through this? I really need some insight on this. Thanks in advance