Hi welcom to HCm I have gone thru your query regarding vomiting up of blood and headaches .I can understand your concern . Dear , fatigue and difficulty in breathing may be the outcome of over exertion or stress , but vomiting up of blood is a serious matter needs immidiate medical attention ,which you should not ignore and get specialist advice ASAP ,instead of wasting time , asking here and there in panic . Meanwhile to take care of all your problems ,Keep your cool Take lemon juice with a glass of water and a spoon of honey for instant energy ,it is a great antioxidant . Deep breathing pranayam Yoga & regular exercise also energises you from inside out Inclusion of balanced diet having fiber ,vitamins ,minerals and supplements full of antioxidants in right proportion enhance blood circulation and help boost your immunity . lot of water intake is very essential . Can take Homeopathic Ferrom Phos 6 / 2 drops in 1/2 cup of water twice half hourly. Avoid constipation , sleeplessness ,stress ,tea ,coffee , smoking ,alcohol . However, do consult your doctor before embarking up on any regimen. Hope this helps solves your query . Take care , All the best .Wish Get well soon . Don t hesitate to get back tf have any further query .