I'm new here and am so happy to read what others have written and I can identify with. I've always been very active. I have been diagnosed with ET and PV. Has anyone out there experienced sudden severe fatigue .. it's as though the battery completely ran down. I feel like I can hardly put one foot in front of the other or it's like walking through deep water. Aside from other symptoms of both blood issues that the toughest to deal with for me. If I'm just too tired to go somewhere, I'm sure no one really understands. Anyone else out there and if so, what do you say to your friend when you just can't go? Thanks - I'm really not a whimp tho sometimes I feel like one. I'm still working as a part-time "lunch lady" in the school system and I'm 80.