After having blood work I passed out. What do I need to do to stop feeling week. Will I be ok.

Syncope. Did you pass out while the blood was being drawn? If so, this is vasovagal syncope which means that your vagus nerve was activated enough to slow your heart too much reducing blood flow to your brain resulting in fainting. Often patients who have this tendency can avoid it by lying flat when their blood is being drawn. It is not loss of blood that makes you faint in this setting.