Falling deep into depression

I know something is physically wrong with me because I haven’t felt normal for over two years now .. I have seen my doctors /e.rs numerous times and they can’t seem to find anything wrong and it’s just taking me deep into depression because I know somethings wrong and they just aren’t doing everything they can to find it. I have consistent chest pain / tightness, pain in my muscles randomly and shooting pains everywhere literally , strong muscle spasms , these weird episodes where it feels like my heart rate goes extremely fast and my body goes from hot to cold in a matter of seconds and goes away within a couple minutes and I just don’t know what to do anymore .. I know it’s not anxiety because it started at a time that I was my happiest and it’s continued for so long but I have a 4 month old baby that I feel I won’t get a chance to see grow up because doctors couldn’t diagnose me soon enough. Sorry y’all I just needed to vent about it today has been such a painful day.