You are not talking to yourself, I have been out all day, so no time to say much except good 400's just one starting with a 4 in the seconds column! Maybe, you lost some muscle, hence strength when you dropped to 12 stone.
-------as for your other problem, try some linseeds (flaxseed). Start with 1 teaspoonful and increase to 1-2 tbsp. They are are a very healthy way of increasing one's fibre as they are high in Omega 3. BUT it is very important when taking these seeds that you have a good intake of water with them. One can soak them in water over night then drink first thing in the morning. There is no taste but the texture is a bit strange but the experience is soon over. You just have to do it! Have a google and see what you think.
Thanks for asking. I actually feel very tired today and haven't gone for a run, nor will I be doing so tomorrow because I am going to the Serpentine Gallery to meet a friend. In fact I will most certainly have an easy, a very easy week this week because I have things on both Friday and Saturday. The event yesterday was in the afternoon not evening. The winds were at least 24mph.
BUT I have managed to fill my morning with admin jobs, many of them involving both the telephone and the pc. Feels good to have got them done and maybe it would have been easier to have gone for a run!