For about 3 weeks now, I've felt really uncomfortable around my heart, every beat it takes, makes me jump. I've also since then have had less to eat everyday and I don't seem to go toilet regularly, I only seem to go when I have around 250-300G of high fibre cereal even though I jog everyday. If I don't have any fibre I sometimes have to wait over a week just to go toilet. Before this problem I used to weigh 67kg, I have now steadily everyday gained weight for the past 3 weeks since this problem started and I am now at a very happy (miserable) 75kg. I have asked countless people whether I have put on weight or not but everyone says I look the same. I can't have put that much weight on and not have a bagel waist. But I do feel as if my legs have gotten quite a bit bigger. My mum thinks I have an under-active thyroid. Will be having a blood test soon to find out what's happening. Posted this to find out if anyone has heard of anything similar or experienced it.