I Am A 22 Year Old Female Who Has Never

I am a 22 year old female who has never smoked and does not drink. I have had bilateral flank pain for quite a while now, but only when I apply a little pressure to the area. However, the pain is not severe but does intensify after I press on it. I've noticed both sides ache when I sit for too long or lie down but have never caused colicky/any severe pain on their own. After I gently press the area it sort of throbs, escalates and then lingers with pain, but despite all my research I'm not sure what it is. Recently, I've completely lost my appetite and have no urge to eat but do so, almost bregrudingly, because I know I have to. Just today I realized a new area of pain in the upper middle to left quadrant of my stomach. I find that when the area is gently pressed a mild-moderate pain is elicited and lingers once again. Any help if possible would be greatly appreciated. Now I am not complexity clueless as what these symptoms could be, but don't want to seem like a hypochondriac.
Thank you for hearing me out,
Michelle C.