Hello Welcome to health care magic Dear patient , feeling dizzi and loosing conciousness and hitting the ground while standing up suddenly is usually due to postural hypotension but it is still better to get a cardiologist s consultation done to rule out any other problem that may cause similar attacks like cardiac dysarrythemia or embolic phenomenon .More over a neurologists openion is also necessary to rule out any seizure like problem . When ever there is a trauma around the eye or on the top of the head ,black eye may result immediately or with in 24 to 48 hours depending upon how fast blood leaks from the traumatised or injured blood vessel and its collection in the soft tissue around the eye which gives rise to bump like swelling called haematoma. Black eyes usually don t cause any problem and it takes 2 to 4 weeks for the blood to get dissolved and disappear depending upon the size of haematoma . wish you speedy recovery thanks Dr Arshad