Hi, I have recently had an unknown illness...it included, nausea, diahrrea, stomach cramps, dizziness, extreme weakness, loss of appetite. The urine and stool results came up with nothing at all and doctor didn t think I needed blood tests at the time of the results, as I was getting better. However, I have not completely got my strength back (6 weeks after getting sick) and when I have late nights/not enough sleep or stress, my chest feels tight and I feel a bit breathless. I can t exercise like I was before because I get too worn out. In the last few days, the veins in my wrists and hands and my feet have been more pronounced. I want to know what s wrong so I can fix it!