I get headaches everyday, tired all the time, random bruises, purple elbows, what could this be ?

See your doctor: This group of symptoms could be explained by something as simple as a viral infection; however, an evaluation by your primary care doctor (with bloodwork) is in order -- make an appointment with your primary care physician.

Many Reasons: There are many causes of headaches including inflammation, vascular, blood pressure, dental, eye, depression, thyroid, etc. However, most people have primary type of headaches: migraine, tension or cluster. See the attached photo. The international headache society list all criteria http://ihs-classification.Org/en/02_klassifikation/.