hi there, am dr.surendran nice to meet you here in HCMagic Most cases of corneal ulcer are due to a bacterial infection that invades the cornea — often following eye injury, trauma or other damage. Contact lens wearers particularly are susceptible to eye irritation that can lead to a corneal ulcer. A contact lens may rub against the eye s surface, creating slight damage to the epithelium that may enable bacteria to penetrate the eye. If you are a contact lens wearer, you can increase your chances of avoiding a corneal ulcer by practicing good hygiene such as washing your hands before handling lenses and following other safety tips. Besides bacterial infection, other causes of corneal ulcers are fungi and parasites he location and size of the ulceration will guide your eye doctor in determining the need for cultures. Most eye doctors see patients with corneal ulcers every one to three days, depending on the severity of the condition. regarding chest pain,just take an ECG and x.ray in order to proceed further. hope i helped your query with regards hcmagic dr.surendiran