I have exactly the same problem Eva. When I saw a hosp consultant quite a few years ago now, all the investigations came back negative. The consultant asked if I'd had any recent shocks and I said I had. He said extreme stress can cause hair to fall out. Im still suffering years later. I now use dry shampoo in between washes and delay washing for as long as possible. I use a hair mascara that camouflages the 'baldish' thining bits, but it's really frustrating whenever I have a special function to attend. Im thinking of getting clip-in hair extensions for the back of my head.