Bluish fingernails, breathing problems

Patient : Hello, I have had quite bluish fingernails for as long as I can remember, I also have quite severe dark circles around my eyes and veins on my body are very visible. The last time in school we were doing a lab exercise where you had to suck in air and my results were horrible, which worries me, since I'm not a regular smoker (I smoke around 10 when I go out - every other week). I don't want to be a smartass, but these things seem to be connected in my newbie opinion. Something like low oxygen levels maybe? Sometimes I catch myself exhaling weirdly and a few people have said to me that I breath funny when were close and quiet (e.g. class). I also remember a few years ago on a routine check the doctor said I have a split heart stream or something along the lines, if that helps in anyway. I went to the doctor and they took my blood, which was more than fine and they dismissed the symptoms as me having a translucent skin. But I'm pretty sure something is not right here. I'm sorry about the category I put my question in, but I couldn't find nothing appropriate. Thank You for your time.
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