Hi, thanks for asking from HCM. I can understand your concern. The headache could be due to : Drug side effect - both lasix and warfarin can cause headache. It is usually diffuse headache, occurs after 30-60 minute of taking drug, non radiating. : Sinusitis headache - Frontal sinusitis can cause headache in forehead region. It is dull, heaviness of head, increases with nasal blockade in cold environment, associated with nasal discharge, relief with steam/hot food or drink. : Stress headache - It can be suspected if there is band like sensation around forehead, dull pain, eye fatigue, more pain with bright light/stress, pain persists even after taking medication/sleeping. You can match your symptoms and reach upto some conclusion. Treatment is : Drug induced - Consult doctor for gradual tapering of medication and replace it with other drug. Do not do it yourself. In acute pain, you can take tablet Diclofenac after proper prescription. : Sinusitis Take steam 4-6times daily Take warm or hot food Avoid cold food, environment Use warm saline nasal drops 4-6 times daily You can take tablet Paracetamol-xylometazoline-Cetrizine after proper prescription. Take antibiotic course like Co-amoxyclav therapy after proper prescription. : Stress headache - It is treated by avoiding stress proper 8 hour sleep head massage take tablet paracetamol or Diclofenac after proper prescription. avoid bright light Hope it will help. Take care.