Please if you have not already, have your doctor do a chest exam and request an echocardiogram (not sure what if it is called the same thing in the UK). It basically checks your heart function. I had the same symptoms after the birth of my son and when he was 6 mos. old they identified that I was one of a group of women that get a heart condition called post partum cardiomyopathy, due to having a child. None of my doctors thought of this possibility because it doesn't happen often. My internist thought I was stressed and gave me an asthma inhaler. Your symptoms sound like many of us that have it. the bathroom need could be because you are retaining too many fluids. Go to your doctor and ask about this. There is also information on a website called ppcmsupport.net (I think is the site) Hope this isn't what you have, I have had a 4 year journey back to good health and would never wish this on anyone. If you do please see the site there are other women out there to talk to about their experience. I would be happy to help with any assistance you need.