Unintentional weight loss

Hi babs I have roughly the same problem hair been thinning lost over stone and half within a month had some blood tests they came back ok waiting to see what the next step is

Yes, this has happened to me on more than one occasion. However, I have hyperthyroidism but I didn't always have it and I still was losing weight uncontrollably. It sounds like you're expeiencing the exact same symptoms that I experienced prior to be diagnosed properly with hyperthyroidism.  I took several blood tests for years and all were negative to thyroidism decease. One day while getting dressed for work I almost passed out and I was have heart palpatations. I actually thought I was having a heart attack. I didn't go to the emergency that day but the next day I went to a quick care clinic and had immediate blood work done. I was called the following day by the head clinic doctor and was told to come in immediately or go straight to the emergency room.  I was told that my levels were very high and that I was a walking heart attack. At that point I only weighed about 100lbs and my normal weight is 125-29lbs. I also had thinning hair the exact same symptoms you're experiencing. You should get blood work taken again very soon because hyperthyroidism can easily be missed. Good luck to you. 

Hyperthyroidism is like to affect in similar way and patient loose weight qickly (varies from person to person). You should get proper opinion and treatment so as to get rid of it as early as possible.